# Analysis: Add Regression Test for Mismatched ENCODING and LOCALE in CREATE DATABASE ## Core Problem The PostgreSQL documentation for `CREATE DATABASE` explicitly states that encoding and locale s...
No substantive technical progress.
No substantive technical progress.
No substantive technical progress.
# Analysis: Parallel DML (Write-Side) Support in PostgreSQL ## Core Technical Problem This thread raises a fundamental architectural question about PostgreSQL's parallel execution framework: **why i...
## Minimal New Activity: Brief Post from Satya Narlapuram A new participant (Satya Narlapuram) has posted a very brief message stating "Looks like this committed a case, attached a patch to fix this....
## Incremental Update: pg_get_policy_ddl() v2 — VARIADIC options API and minor review ### Key Development Akshay Joshi has posted a **substantially reworked version** of `pg_get_policy_ddl()` that a...
## Commit Intent Announced by Fujii Masao Fujii Masao (committer) has signaled intent to commit the v5 patch and backpatch it to v17. This is a brief message with no new technical arguments — it's a ...
## Lepikhov's Response to Parragi's Review Lepikhov responds to the two issues raised by Zsolt Parragi, but does **not** provide a new patch version. The response is brief and primarily acknowledges/...
# ERROR during COMMIT PREPARED Can Leave Orphaned Locks ## Problem Statement This thread identifies a subtle but serious bug in PostgreSQL's two-phase commit (2PC) implementation where an ERROR occ...
# Splitting pg_resetwal Output Strings: Dynamic Column Alignment for Translatable Output ## Core Problem PostgreSQL's `pg_resetwal` (and similar tools like `pg_controldata`) produce tabular output ...
## Incremental Update: Core Committer Opposition Emerges The most significant development since the initial analysis is that **two core committers** (Tom Lane and Peter Eisentraut) have now weighed i...
## Incremental Update: New Messages (2026-05-22 to 2026-05-24) ### Summary of New Activity Two brief messages advance the discussion incrementally: 1. **Atsushi Torikoshi** responded to a prior rev...
No substantive technical progress.
# Fix pg_get_multixact_stats() members_size Calculation ## Core Problem The `pg_get_multixact_stats()` function, introduced to help DBAs monitor multixact storage consumption, contains an integer a...
## Update: Patch Committed The thread has reached its conclusion with the patch being committed. The two new messages are brief confirmations: 1. **Andreas Karlsson** confirmed agreement that the fi...
# Tighten SCRAM Iteration Parsing and Bound libpq PBKDF2 Work ## Core Problem This thread addresses two distinct but related security/correctness issues in PostgreSQL's SCRAM-SHA-256 authentication...
## Incremental Update: Clarification on Relationship to Vitaly's Bug Report The patch author (sjh910805@gmail.com) responds to Álvaro Herrera's earlier question about whether this patch is related to...
No substantive technical progress.
# Permission Elevation via pg_amcheck Operator Overloading Through search_path Manipulation ## Core Problem This thread raises a security vulnerability in `pg_amcheck` — PostgreSQL's built-in tool ...
## Incremental Update: Additional Affected Functions Confirmed Shveta Malik confirms reproducibility of the same replication slot leak bug across three more SQL-callable logical decoding functions: ...
# Technical Analysis: Report Oldest Xmin Source When Autovacuum Cannot Remove Tuples ## Core Problem PostgreSQL's VACUUM process cannot remove dead tuples that are still visible to any active transa...
## Incremental Analysis: Evgeny's Rebuttal on getaddrinfo() Reliability and DNS Client Concerns Evgeny returns after an 11-day pause with a carefully researched counter-argument to Jacob Champion's p...
## Incremental Update: Patch V4 and Commit ### Summary The thread concluded with a minor V4 revision and the patch being committed by Fujii Masao. ### V4 Change (Minor) The only code change from V...
No substantive technical progress.
# Removing Broken Support for OpenSSL without ECDH ## Technical Problem PostgreSQL's SSL/TLS implementation contains dead code paths guarded by the `OPENSSL_NO_ECDH` preprocessor macro, which was i...
## v3 Patch Submitted by Mats Kindahl (2026-05-24) Mats responds to Surya Poondla's review with a revised patch (now a single consolidated patch rather than split commits) addressing all raised issue...
## New Review Round: Pre-existing Origins on Target Cluster & Trivial Code Issues Two new reviewers weigh in on v6, shifting focus to an operational edge case and minor code cleanup. ### Shlok Kyal'...
## Round Update: Peter Smith's Detailed Review of Nisha's v6-0001 and v6-0002 Peter Smith provided two separate reviews covering patches v6-0001 and v6-0002. These contain substantive technical feedb...
No substantive technical progress.
# Technical Analysis: psql SQLSTATE Macro Name Display in Verbose Error Reports ## Core Problem When PostgreSQL's `psql` client displays verbose error messages (activated via `\set VERBOSITY verbose...
# Technical Analysis: Improving Index Selection for Logical Replication Apply with Replica Identity Full ## Core Problem When PostgreSQL performs logical replication with `REPLICA IDENTITY FULL`, U...
# Technical Analysis: Fix NULL Dereference in Subscription REFRESH on Concurrent DROP ## Core Problem This thread addresses a **crash bug** (segfault) in PostgreSQL's logical replication subscripti...
## New External Tester Report — First Substantive Feedback in Months Solai (solai.cdac@gmail.com) provides the first external testing report since Mahendra's earlier reviews. The message confirms bas...
## Incremental Update: Minor Style Suggestion, No Substantive Change Two new messages since the last analysis introduce a minor stylistic suggestion but no change to the patch or its technical direct...
## Incremental Analysis: API Redesign to Prevent Future Bugs ### Summary of New Development The discussion has evolved from a simple point fix (adding `RequestDisableLogicalDecoding()` to REPACK cle...
No substantive technical progress.
No substantive technical progress.
## New in this round: Ishii identifies missing tree-walker coverage for RPCommonSyntax A single new message from Ishii (2026-05-24) with a patch on top of v47. ### Technical content Ishii noticed t...
# Incremental View Maintenance (IVM) for PostgreSQL — Deep Technical Analysis ## Core Problem Materialized views in PostgreSQL can only be refreshed via `REFRESH MATERIALIZED VIEW`, which recompute...
## Incremental Update: Patches Committed + Post-Commit Review ### Resolution: Both Patches Applied Michael Paquier committed the v3 patch set on 2026-05-22: - **v3-0001** (the CONNECTING visibility...
## Incremental Update: First Substantive Review from Lukas Fittl + PGConf.Dev Discussion ### What's New Lukas Fittl (pganalyze maintainer and long-time pg_stat_statements stakeholder) has provided t...
## Round Update: Three New Bugs (TOAST, Parallel Workers, Column Swap), pg_dump Issues, v38 Posted, and Peter Smith's v38 Review This round surfaces three significant functional bugs from Nisha's tes...
## Incremental Update: Draft Patch Submitted (v1) Enrique Sánchez has submitted a concrete implementation as a 4-commit patch series implementing Solution 1 (MCV cap for missing values). This moves t...
## Incremental Update: Continued Discussion on Fix Approach The thread has a brief exchange between Kirill Reshke and Álvaro Herrera clarifying positions on the solution approach, but no patches or s...
No substantive technical progress.
# COPY TO BLACKHOLE / pg_dump -j -Fb ## Technical Analysis ### Core Problem This thread, initiated by Jakub Wartak (EDB), proposes the concept of a "COPY TO BLACKHOLE" facility — essentially a mec...
## Incremental Update: Tom Lane's Architectural Review — Catalog Simplification and Permissions Concerns ### Summary Tom Lane provided a substantive design review of the v7 patch, offering concrete ...
## Incremental Analysis: Detailed Code Review of v2 Patch This round consists of a comprehensive review by Peter Smith (32 review comments) and a brief comment from Jian He (japinli), followed by a s...
## Resolution of the `019_replslot_limit.pl` Race Condition The thread reaches consensus on fixing the replication slot state race exposed by the faster WAIT FOR LSN-based `wait_for_catchup()`. ### ...
## Round Update: v37 Posted, Code Organization Debate, TupleDesc Caching Suggestion, Schema Rename Won't-Fix Consensus, and pg_upgrade Subscription-OID Separation Proposal This round is primarily rev...
No substantive technical progress.
# Optimize LISTEN/NOTIFY: Deep Technical Analysis ## Core Problem PostgreSQL's LISTEN/NOTIFY mechanism suffers from a fundamental scalability bottleneck: **SignalBackends() has no knowledge of whic...
# Rename Postgres 19 to Postgres 26 (Year-Based Versioning) ## Core Problem This thread proposes a fundamental change to PostgreSQL's versioning scheme: shifting from sequential integer major versi...
# Technical Analysis: Add WHERE Clause Support to REFRESH MATERIALIZED VIEW ## The Core Problem PostgreSQL's materialized views (MVs) have a fundamental scalability limitation: the only way to upda...
## Incremental Update: Patch 0004 Pushed, Reverted Due to Buildfarm Failures, Then Re-pushed with Different Test Strategy ### Key Events 1. **Patch 0004 (reject degenerate no-op split) was pushed** ...
# Pg_upgrade Bug with NOT NULL NOT VALID Constraints ## Core Problem This thread identifies a **pg_upgrade compatibility bug** introduced by PostgreSQL 18's treatment of NOT NULL constraints as fir...
## Incremental Update: Parallel Query Safety Fix (FreeBSD CI Failure) ### What's New A FreeBSD CI failure exposed a fundamental interaction problem between the new pgstat-based architecture and para...
## Incremental Update: New Reproducer for `pg_logical_slot_get_changes` and Author Acknowledgment ### New Bug Vector Identified Vignesh C identifies another affected SQL-callable function: `pg_logic...
# Technical Analysis: Remove Obsolete LISTEN Array Growth Isolation Test ## Core Problem This thread presents a straightforward cleanup patch that removes an isolation test related to LISTEN's inte...
# Feature Request: Native Nanosecond Precision Support for PostgreSQL Temporal Types ## Core Problem PostgreSQL's temporal types (`timestamp`, `timestamptz`, `time`, `interval`) currently provide *...
# Multi-Entry Indexing for GiST & SP-GiST: Deep Technical Analysis ## Core Problem PostgreSQL's GiST (Generalized Search Tree) and SP-GiST (Space-Partitioned GiST) access methods fundamentally assu...
## Incremental Analysis: v3 Patch Submission ### Summary of New Technical Content Mohamed Ali submitted v3 of the patch with two significant architectural improvements and a design question for the ...
No substantive technical progress.
# RFC: Allow EXPLAIN to Output Page Fault / Storage I/O Information ## Core Problem When diagnosing slow queries, PostgreSQL's `EXPLAIN (ANALYZE, BUFFERS)` tells you whether pages were found in sha...
## New Review from Surya Poondla (2026-05-21) Surya Poondla provides the first substantive external review of the v2 patch, confirming it applies/builds cleanly and that the core algorithm is sound. ...
## Incremental Update: Resolution on v2 Approach + New Bug Discovery ### Convergence on v2 The debate about whether to show timestamp fields during CONNECTING state has resolved. Michael Paquier de...
# Technical Analysis: Reentrancy Guards in ri_triggers.c ## The Core Problem This thread addresses a **use-after-free vulnerability** in PostgreSQL's referential integrity trigger system (`ri_trigg...
No substantive technical progress.
# Deadlock Detector Fails to Activate on Hot Standby Replica ## Core Problem This thread identifies a subtle but serious bug in PostgreSQL's hot standby recovery mechanism where the deadlock detecti...
# amcheck Support for BRIN Indexes: Deep Technical Analysis ## Core Problem PostgreSQL's `amcheck` extension provides corruption-detection capabilities for B-tree indexes (and more recently GIN ind...
# Graph Database Developer Meeting at pgconf.dev 2026: Technical Analysis ## Core Problem and Context With basic SQL/PGQ (Property Graph Queries) support committed to PostgreSQL 19, the community fa...
## Incremental Update: Patch Accepted by Committer Michael Paquier (committer) has acknowledged the bug and committed to fixing it. He confirms the root cause as a typo originating from commit `d08c4...
## New in this round: Pyhalov identifies architectural weakness in Korotkov's "no fpinfo on function rel" design — surfaces three concrete problems A single dense message from Pyhalov that challenges...
## Ashutosh Bapat Identifies Two Additional Problems, Plans to Commit Current Patch First Bapat confirms the current patch is ready to commit and should not be blocked by newly discovered issues. He ...
## Resolution: Bug Not Reproducible on Vanilla PostgreSQL Maksim Melnikov returns after investigation and confirms that the reported bug **cannot be reproduced on vanilla PostgreSQL**. The issue is s...
No substantive technical progress.
## Incremental Update: Patch Committed ### What's New Fujii Masao has committed the patch. His message "I've pushed the patch. Thanks!" confirms the fix has been applied to the repository. This clos...
## Incremental Update: Review Feedback and Patch v2 ### Summary The thread saw its first external reviewer (Arseniy Mukhin) who confirmed the bug is reproducible and the fix is correct. A minor pack...
# Analysis: effective_wal_level Not Decreasing After REPACK (CONCURRENTLY) ## Core Problem This thread identifies a bug in the interaction between PostgreSQL's new dynamic WAL level toggling featur...
No substantive technical progress.
## Incremental Update: Minor Code Review Discussion on Follow-up Patch ### What's New The thread has two new messages that constitute a focused code review exchange between an unnamed reviewer (ah@c...
# Set Notice Receiver Before libpq Connection Startup ## Core Problem PostgreSQL's `libpqsrv` infrastructure (used by extensions like dblink and postgres_fdw to make outbound libpq connections from...
No substantive technical progress.
## Incremental Update: v5→v6, Test Coverage Added, Version Check Debate Resolved ### New Test Cases (v5) Jim Jones proposed and contributed concrete regression tests for the `\d` deduplication behav...
# Prevent Setting NO INHERIT on Partitioned Not-Null Constraints ## Core Problem PostgreSQL's partitioning system requires that NOT NULL constraints on partitioned tables are always inherited by ch...
# Patch for Bind Message: Unsigned Integer Handling for Parameter and Result Column Format Codes ## Core Technical Problem The PostgreSQL frontend/backend protocol (v3) specifies that certain count...
## Incremental Update: Independent Benchmark Validation by Lepihov ### Summary Lepihov (Andrei Lepikhov) followed up on his earlier suggestion about avoiding unnecessary cache lookups with independe...
No substantive technical progress.
## Alvaro Concedes: db-specific Snapshots Will Be Reverted for PG19 A single new message from Alvaro (2026-05-19) formally accepts the revert path. This is the decision point the thread has been buil...
# Extended Statistics Improvement: Multi-Column MCV Missing Values ## Core Problem PostgreSQL's extended statistics system has a significant blind spot in how it handles multi-column Most Common Va...
## Incremental Update: Test Coverage Expansion and Backpatch Strategy ### What's New Fujii Masao reviewed the TAP test proposed by Srinath and identified a gap: the test only verified the group-acce...
No substantive technical progress.
# Relfilenode Statistics: Deep Technical Analysis ## The Core Problem PostgreSQL's statistics subsystem (`pgstats`) currently keys relation-level statistics by the relation's OID. This creates a fu...
## Incremental Update: v2→v4 Patch Evolution and Scope Expansion ### Key Development: Scope Expanded to `\d+` Command Jim Jones identified an analogous redundancy problem in the `\d+` (describeOneT...
# Technical Analysis: Ternary Reloption Type Patch Review ## Core Problem PostgreSQL's relation options (reloptions) system historically supported boolean, integer, real, enum, and string types. Se...
# Technical Analysis: Review Observations for COPY ON_ERROR_TABLE Patch ## Core Problem The COPY ON_ERROR_TABLE feature extends PostgreSQL's existing `COPY ... ON_ERROR` mechanism (introduced in Po...
## Incremental Update: v2 Resubmission — Regression Test Stability Fixes Only The sole new message is from the patch author (Ilmar Yunusov) submitting **v2** of the series. There are **no accounting-...
# Technical Analysis: Failure in test_slru for host gokiburi (REL_16_STABLE only) ## Core Problem This thread identifies a subtle bug in the `test_slru` contrib module's LWLock initialization logic ...
## What's new in this round A single short message from Vlad Lesin confirming he has reworked the test patch to address Michael's rejection of the multi-wakeup semantics (0002). ### Vlad adopts dist...
## New Bug: `wait_for_catchup()` with WAIT FOR LSN Causes Race in Replication Slot State Tests Alexander Korotkov reports a **new class of test failure** caused by the WAIT FOR LSN-based `wait_for_ca...
# Fix pg_stat_wal_receiver to Show CONNECTING Status ## Core Problem Commit `a36164e74` introduced a `WALRCV_CONNECTING` state to the WAL receiver subsystem, explicitly motivated by monitoring use ...
## Incremental Update: Proposal for Centralized DefElem Option Handling A new participant (Thom) raises an architectural question about the root cause of the duplicate-option bug: the lack of shared ...
## Incremental Analysis: Review Discussion on Backpatching and Test Placement ### Summary of New Activity Fujii Masao reviewed the patch set and provided feedback on two key areas: (1) test placemen...
# Technical Analysis: Make the Logical Replication Conflict Messages More Like Each Other ## Core Problem The logical replication subsystem in PostgreSQL generates conflict messages (via `conflict.c...
## Incremental Update: External Testing Confirmation of v5 ### Summary No substantive technical progress in this round. The only new message is an independent testing confirmation from Solai (a new ...
## Round Update: Minor Review Fixes, v35/v36 Posted, \dRs+ Ordering Bug Found This round is predominantly code-style cleanup and patch housekeeping. No new design decisions or policy shifts occurred....
# Deep Technical Analysis: VACUUM FULL / CREATE INDEX Fails with "missing chunk number 0 for toast value" ## Core Problem This thread identifies a subtle but serious consistency bug in PostgreSQL's ...
# Support LIKE with Nondeterministic Collations ## Core Problem PostgreSQL's nondeterministic collations (introduced by Peter Eisentraut) enable case-insensitive, accent-insensitive, and other Unic...
## Incremental Update: New Participant Shares Concrete Implementation Work ### What's New Greg Burd has responded to Pavel Stehule's original post with a concrete (though incomplete) implementation ...
# Technical Analysis: Preventing Repeated Deadlock-Check Signals in Standby Buffer Pin Waits ## Core Problem In PostgreSQL's hot standby recovery conflict resolution, there is a behavioral asymmetr...
# Technical Analysis: Cirrus CI Shutdown and PostgreSQL CI Infrastructure Migration ## The Core Problem Cirrus CI, the continuous integration platform that PostgreSQL's community development infrast...
## Round Update: Nisha's v6 Patch Set — Responses to Peter Smith's Review Nisha posted the v6 patch set addressing Peter Smith's 28-point review. The response contains several technically interesting...
## What's New A single follow-up from **Daniel Gustafsson** confirming the fix has been **committed and backpatched to v18**. Key new data points: 1. **Commit is done.** The fix has been pushed to t...
## New in this round: Korotkov posts v5 addressing all five Pyhalov bugs, then two rapid follow-up fixups for whole-row Var edge cases in DirectModify/outer-join paths This round shows the patch ente...
# Technical Analysis: Review Observations for Partial REFRESH MATERIALIZED VIEW Patch ## Core Problem Materialized views in PostgreSQL currently support only full refresh semantics — the entire mat...
# Technical Analysis: Unbounded Wait to Reach Consistent Recovery State After pg_rewind ## Core Problem After `pg_rewind` is used to resynchronize a former primary with a new primary, the rewound n...
No substantive technical progress.
## v3 Patch Committed + Follow-up Cleanup Patch ### Key Development: Patch Committed Álvaro Herrera has **committed** the v3 patch (PG_ENSURE_ERROR_CLEANUP approach) with minor cosmetic/comment chan...
No substantive technical progress.
No substantive technical progress.
No substantive technical progress.
# Fix Incorrect Size Check in `statext_dependencies_deserialize` ## Core Problem The function `statext_dependencies_deserialize()` in PostgreSQL's extended statistics subsystem contains a bug in it...
## Incremental Update: Alternative Approaches Explored and Dismissed ### Shveta's Agreement and New Alternative Ideas Shveta Malik formally endorsed Approach 2 (origin creation timestamp) as the mos...
## Patch Committed Daniel Gustafsson's single-word "Done." confirms the 32-bit atomics removal patch has been committed to HEAD. No new technical discussion, no new arguments, no new participants. Th...
# Deep Technical Analysis: LISTEN Startup Race with Direct Advancement ## The Core Problem This thread identifies a subtle race condition in PostgreSQL's asynchronous notification system (`async.c`...
No substantive technical progress.
# COPY FROM ON_ERROR SET_NULL Bypasses Domain NOT NULL with Partial Column List ## Core Technical Problem This thread addresses a memory safety bug in PostgreSQL's COPY FROM implementation that caus...
# Technical Analysis: Fix Minimal Typo in OAuth ## Core Problem This is a trivial cosmetic fix addressing a minor typo in PostgreSQL's OAuth authentication code — specifically a forgotten/missing q...
# Technical Analysis: Avoiding System Path Leakage from pg_available_extensions ## Core Problem The thread identifies an information disclosure vulnerability in the recently added `location` column...
## Incremental Update: v21 Patch and Response to Robert's Concerns ### What's New Bertrand Drouvot posted v21 of the patch series, responding to Robert Haas's two open concerns from the previous rou...
# Technical Analysis: contrib/anyarray — Generalizing intarray to Any Array Type ## Core Problem PostgreSQL's `contrib/intarray` module has long been one of the most popular extensions for users wh...
No substantive technical progress.
## Incremental Update: Patch v2 Posted by Ayush Tiwari Ayush Tiwari has posted v2 of the patch on behalf of / building on Satya's original fix, addressing the style review comments from Ashutosh Bapa...
## Incremental Update: Patches 0001-0003 Committed, Collation Bug Found in 0004 ### Major Development: Patches Committed Alexander Korotkov pushed patches 0001 through 0003 (the core bound-overlap b...
## Incremental Update: Paul Jungwirth (FOR PORTION OF author) Responds Paul Jungwirth, the author of the `FOR PORTION OF` implementation, has weighed in and taken a clear position **against** treatin...
# Technical Analysis: refint Plan Cache Bug and Resolution ## The Core Problem The `contrib/spi/refint` module provides `check_foreign_key()` and `check_primary_key()` trigger functions that implem...
# Move FOR PORTION OF Checks Out of Analysis ## Core Problem The `FOR PORTION OF` feature (a temporal/period-based SQL construct being added in PostgreSQL 19) has validation checks that are current...
## Round 4: Zsolt Parragi's Follow-up — Exclusion Constraints Work, Trigger Visibility Concern This is a brief follow-up message from Zsolt Parragi that makes three narrow but technically significant...
# Technical Analysis: vacuumdb --exclude-database Option ## Core Problem The `vacuumdb --all` command in PostgreSQL's client utilities vacuums every connectable database on a cluster without except...
No substantive technical progress.
## Incremental Update: Scope Expansion to Composite Types and Arrays ### New Technical Direction: Beyond Domains Sami Imseih proposes extending `vacuumlo`'s column scanning beyond just domain resol...
# Fix Small Issues of pg_restore_extended_stats() ## Technical Context `pg_restore_extended_stats()` is part of PostgreSQL's statistics import/export infrastructure, which allows `pg_dump`/`pg_rest...
# Technical Analysis: Misleading Error Message in ProcessUtilitySlow T_CreateStatsStmt ## Core Problem This thread begins with a seemingly simple observation about a misleading error message but ev...
## Incremental Analysis: v3 Patch Using PG_ENSURE_ERROR_CLEANUP ### Key Technical Development The thread has converged on a third approach after both v1 and v2 were found to have fundamental flaws. ...
# pgstat: Flush Some Statistics Within Running Transactions, Take 2 ## Core Problem PostgreSQL's statistics subsystem (`pgstat`) accumulates counters in backend-local memory and only flushes them t...
## Incremental Update: v2 Patch Posted Paul Jungwirth posted a v2 of his own patch for this issue. The key technical development: ### Patch Evolution: v1 → v2 - **v1** (referenced but not in this m...
# Technical Analysis: postgres_fdw User Mapping Inconsistency in ANALYZE with restore_stats ## Core Problem When `ANALYZE` is run on a foreign table managed by `postgres_fdw`, the system must establ...
## Incremental Update: Minimal Progress — Consensus Forming on Pragmatic Fix The two new messages are brief and contain no new technical content, patches, or architectural arguments. They represent a...
# Technical Analysis: Review Comments on createPartitions() in pgbench.c ## Core Problem This thread raises code robustness concerns in the `createPartitions()` function within `pgbench.c` — Postgr...
No substantive technical progress.
No substantive technical progress.
## Round Update: v34 Posted, `allow_system_table_mods` Gap Accepted as Won't-Fix, New Bug Found (disable_on_error + CLT), and Peter Smith's 0003 Review This round has one genuinely new bug report (Ni...
## Incremental Update: New Scenario Discussion and Scope Clarification ### New Technical Discussion: ALTER SUBSCRIPTION Publisher-Switching Scenario Shveta Malik raised a new scenario that extends t...
# Technical Analysis: pg_get_publication_ddl Function ## Core Problem PostgreSQL lacks a built-in function to reconstruct the DDL (Data Definition Language) statement for PUBLICATION objects. This ...
# Technical Analysis: Null Pointer Dereference in FOR PORTION OF with Views and INSTEAD OF Triggers ## Core Problem A null pointer dereference crash occurs in PostgreSQL 19 when combining three fea...
## Incremental Update: Committer Attribution Concern The only new message is from **Bruce Momjian**, who attempted to commit the patch but hit a procedural/policy obstacle rather than a technical one...
# Technical Analysis: Avoiding Table Rewrite When Setting Column Type to Constrained Domain ## Core Problem When PostgreSQL executes `ALTER TABLE ... ALTER COLUMN ... SET DATA TYPE`, it traditional...
## Incremental Analysis: New Response from Huseyin ### Summary A new participant (Huseyin) responds with approval of the patch but raises a tangential but technically interesting observability conce...
# Technical Analysis: REPLICA IDENTITY USING INDEX Accepts Columns with NOT NULL NOT VALID ## Core Problem This bug report identifies a logical replication correctness issue introduced as a side ef...
## Patch Committed and Back-Patched The primary development this round is that **Alexander Korotkov pushed the fix** on 2026-05-14. The commit covers master, with back-patches to PG17 and PG18 requir...
# Technical Analysis: Redundant/Mis-use of _(x) gettext Macro ## Core Problem This thread begins with what appears to be a simple cleanup — removing seemingly unnecessary `_()` gettext macro wrappi...
## Incremental Update: Thread Resolved — Patch Reviewed, Refined, and Pushed ### Summary The thread reached resolution quickly. Tatsuo Ishii reviewed the original patch, suggested a clean encapsula...
No substantive technical progress.
# DOCS: Describe Missing Parameters on CREATE/ALTER PUBLICATION Pages ## Core Problem The PostgreSQL documentation for `CREATE PUBLICATION` and `ALTER PUBLICATION` SQL commands contains an inconsis...
# Deep Technical Analysis: FATAL Message Lost Inside libpq During Standby Logical Decoding ## Core Problem The test `035_standby_logical_decoding` intermittently fails on the buildfarm because a FA...
# Technical Analysis: Replacing Deprecated `txid_current()` with `pg_current_xact_id()` and the xid8 Arithmetic Operator Question ## Core Problem PostgreSQL has a legacy problem in its transaction ...
# Bug Analysis: pg_rewind Produces Unusable but Starting Database with Standby Recovery ## Core Problem This thread identifies a subtle and dangerous bug in PostgreSQL's recovery infrastructure whe...
# Analysis: PostgreSQL Hacker Mentoring Program 2026 — Call for Applications ## Overview This thread documents the third year of Robert Haas's 1:1 hacker mentoring program, which pairs aspiring Post...
No substantive technical progress.
## New Developments (Since Prior Analysis #3) ### Jeff Davis posts v5 — a 4-patch series addressing Evan's tablesync-slot concern (2026-05-14) Jeff restructured his approach into a more granular ser...
## Round Update: First serious code review exposes multiple bugs in v11 ### New Participant: Zsolt Parragi (Percona) Zsolt Parragi provides the **first in-depth code review** of the v10/v11 patch se...
# Technical Analysis: Set calcSumX2 = true in numeric_(poly_)deserialize ## Core Problem This thread addresses a subtle but semantically important bug in PostgreSQL's aggregate deserialization func...
## Incremental Update: Alexander Korotkov Takes Over Patch Revision, Signals Intent to Commit ### Key Development Alexander Korotkov (Supabase) has reviewed and revised the 4-patch series, making su...
No substantive technical progress.
## Incremental Update: v3→v5 Evolution and Policy Handling Resolution ### Key Development: Policy Error Path Dropped from Patch The most significant technical development since the last analysis is...
# Analysis: Trivial Comment Fix in pgstat_assoc_relation() ## Core Problem This is a minor code hygiene issue in PostgreSQL's statistics subsystem. The function `pgstat_assoc_relation()` contains a...
## What's new in this round Two concrete developments: Vlad submits a revised patchset responding to Michael's review, and Michael partially commits and gives directional feedback on the remaining pa...
## Round Update: Peter Smith's Detailed Review of Nisha's v5-0001 (TABLES IN SCHEMA EXCEPT) Peter Smith provided a comprehensive 28-point review of Nisha Moond's v5-0001 patch for `FOR TABLES IN SCHE...
# libpq Async API Deadlock with SSL Records >8kB ## The Core Problem The libpq asynchronous API has a fundamental architectural flaw: it assumes that after calling `pqReadData()` once, if no comple...
## Incremental Update: Ashutosh Bapat's Review and v3 Patch Restructuring ### New Reviewer: Ashutosh Bapat (2026-05-14) Ashutosh Bapat, a key contributor to SQL/PGQ infrastructure, weighed in with a...
# Technical Analysis: Add NESTED_STATEMENTS Option to EXPLAIN ## Core Problem PostgreSQL's `EXPLAIN` command has a fundamental observability gap: it cannot show execution plans for SQL statements th...
## Incremental Update: v23 Patch Set Submitted The author (hukutoc@gmail.com) has submitted v23, addressing most of Alexander Korotkov's 8 review points from the previous round. The key development i...
# Deep Technical Analysis: Reducing EXPLAIN ANALYZE Timing Overhead via RDTSC ## Core Problem EXPLAIN ANALYZE with TIMING ON in PostgreSQL nearly **doubles** query execution time for simple, row-in...
# SQL Property Graph Queries (SQL/PGQ) - Deep Technical Analysis ## Problem Statement This thread tracks the implementation of SQL Property Graph Queries (SQL/PGQ) as specified in SQL:2023 (ISO/IEC...
## New in this round: Tomas raises EPQ (EvalPlanQual) as a fundamental barrier to extending parallel DML beyond INSERT Tomas posts a detailed "brain dump" that introduces two new technical dimensions...
# Re-adding Regression Tests for ltree and intarray: Stack Depth and Platform-Specific Recursion Failures ## Core Problem Regression tests for the `ltree` and `intarray` contrib extensions were **r...
# Fix Bug of COPY TO Support Partition Table ## Core Problem The "Support COPY TO for partitioned tables" feature introduced a bug in the attribute mapping logic when converting partition tuples to...
# Technical Analysis: Exposing Checkpoint Timestamp and Duration in pg_stat_checkpointer ## Core Problem PostgreSQL's checkpointer process is critical to database reliability — it ensures dirty buf...
# Logical Replication: Revisiting `is_table_publication` and `is_schema_publication` Implementation ## Core Problem In PostgreSQL's logical replication subsystem, two internal functions — `is_table...
## New Development: Amit Kapila's Final Technical Position Before Beta-1 Amit Kapila has posted a single substantive message that crystallizes his position and adds two new technical observations not...
No substantive technical progress.
## Round Update: Patch revision — `pg_atomic_write_membarrier_u32()` optimization Sawada posted a minor but technically meaningful patch revision. The change is narrow and surgical: ### Technical Ch...
# Fix the Race Condition for Updating Slot Minimum LSN ## Core Problem This thread addresses a race condition in PostgreSQL's replication slot WAL reservation mechanism that can lead to **premature...
No substantive technical progress.
# Technical Analysis: Improving Test Failure Output in PostgreSQL's Meson Build System ## Core Problem PostgreSQL's test infrastructure, particularly when using the Meson build system, produces deep...
# Bound Memory Usage During Manual Slot Sync Retries ## Core Problem PostgreSQL's `pg_sync_replication_slots()` SQL function, introduced to allow manual synchronization of replication slots on stan...
# Fix Bug of COPY (on_error set_null) — Array Indexing Mismatch ## Core Problem This thread reports a **memory safety bug and correctness violation** in the recently added `COPY ... (on_error set_n...
# Deep Technical Analysis: DELETE/UPDATE Corruption in Partitioned Foreign Tables ## The Core Problem This thread addresses a data corruption bug in PostgreSQL's Foreign Data Wrapper (FDW) infrastr...
## New Participant Takes Over Patch, Rapid Iteration to v3, Then Committer Revision ### Original Author Steps Back Zeng Man (original reporter/patch author) explicitly stated they are too busy with ...
## Incremental Update: New Review from Solai A new participant (Solai) has posted a review/testing report that adds modest technical substance to the discussion, primarily reinforcing existing argume...
# Adding a Stored Generated Column Without Long-Lived Locks ## The Core Problem When adding a stored generated column to an existing table in PostgreSQL, the operation requires a full table rewrite...
# Technical Analysis: Add a Guard Against Uninitialized Default Locale ## The Core Problem This thread addresses a **defensive programming concern** in PostgreSQL's locale/collation infrastructure:...
# Add Missing Period to HINT and DETAIL Messages ## Core Problem PostgreSQL has a documented error message style guide that mandates: "Detail and hint messages: Use complete sentences, and end each...
# pg_stash_advice: Crash Loop from Overlong Stash Name in Persistence Dump File ## Executive Summary This thread reports a serious availability bug in the `pg_stash_advice` extension (apparently a ...
# Simplify Signature of ProcessStartupPacket() ## Technical Problem This thread addresses a code cleanup opportunity in PostgreSQL's connection startup path. The function `ProcessStartupPacket()` —...
# Fix Array-Element Quoting in postgres_fdw Import Statistics ## Core Problem The `postgres_fdw` extension's statistics import feature (`ANALYZE` on foreign tables) constructs a remote query agains...
# Lazy Snapshot Distribution in Logical Decoding ## Core Problem: O(N²) Snapshot Growth in the Reorder Buffer This patch addresses a fundamental scalability problem in PostgreSQL's logical decoding...
## Incremental Update: Buildfarm Client Bug Fixed for Log Capture (2026-05-16) Andrew Dunstan reports he has identified and fixed the buildfarm client bug that was preventing `pg_upgrade_output.d/` l...
No substantive technical progress.
# pg_recvlogical: File Permission Bug Analysis ## Core Problem `pg_recvlogical` is PostgreSQL's tool for receiving logical replication changes from a source cluster. Its documentation claims it pre...
# Bug Analysis: mdunlinkfiletag Unlinks Wrong Fork/Segment ## Core Problem The `mdunlinkfiletag()` function in PostgreSQL's magnetic disk (MD) storage manager has a latent bug where it always unlin...
# Technical Analysis: LIKE Fails to Match Literal Backslashes with Nondeterministic Collations ## Core Problem PostgreSQL's LIKE operator produces incorrect results when matching patterns containin...
# Technical Analysis: pg_get_subscription_ddl() Function Patch ## Core Problem PostgreSQL lacks a built-in function to reconstruct the DDL (Data Definition Language) statement for logical replicati...
No substantive technical progress.
## Incremental Update: REPACK Option Parsing Bugs Discovered and Fixed The original tab-completion patch has been committed. More significantly, Fujii discovered two additional **server-side parsing ...
# Technical Analysis: SCRAM Passthrough Option Precedence in postgres_fdw and dblink ## Core Problem PostgreSQL's foreign data wrapper infrastructure (postgres_fdw and dblink) supports the `use_scr...
# Technical Analysis: Determinism of pg_dump Table Output Ordering ## Core Problem A user observed that two semantically identical PostgreSQL schemas—one created from scratch via DDL scripts and on...
## Incremental Update — Buildfarm Preparation (May 16) The thread advanced on the operational/infrastructure side, not on patch content. ### Key Development: Buildfarm Client Updated Andrew Dunstan...
# Deep Technical Analysis: Fix Overflow and Underflow in regr_r2() (and regr_intercept()) ## The Core Problem PostgreSQL's statistical regression aggregate functions operate on `float8` (IEEE 754 d...
## Incremental Update — 2026-05-14 through 2026-05-16 ### Summary A new reviewer (Zsolt Parragi from Percona) joined the thread and surfaced three concrete issues with the patch. Two were real bugs...
## Incremental Update: Patch Reorganization and CI Fix ### What's New The author (Sami Imseih) posted a revised patchset with two significant changes: 1. **CI failure fix in serialization callback*...
# Documentation Gap: Invalid Index Skipping During ATTACH PARTITION ## Core Problem When `ALTER TABLE ... ATTACH PARTITION` is executed, PostgreSQL attempts to match indexes on the partition being ...
# Technical Analysis: Truncate Logged Statements by Maximum Length ## Core Problem PostgreSQL's logging infrastructure has no built-in mechanism to limit the size of individual logged statements. W...
# Deep Technical Analysis: Fixing WAL Segment Creation Accounting in `log_checkpoints` ## The Core Problem PostgreSQL's `log_checkpoints` output includes a field "WAL file(s) added" (internally `ck...
## Incremental Update: Review Progress and Duplicate Slot Bug Discovery ### Summary Shveta Malik continues her review of the v-latest patch series, reporting that the patch reordering (0001 parser r...
# PSQL Publication Describe Command: Filtering Redundant Table Listings ## Core Problem The `\dRp+` command in psql (which describes publications in detail) displays redundant information when a pu...
No substantive technical progress.
No substantive technical progress.
# Documentation Fix: pg_restore_extended_stats() Example Syntax Error ## Core Problem A trivial but potentially confusing typo was identified in the PostgreSQL documentation for the `pg_restore_ext...
No substantive technical progress.
# Sequence Access Methods: A Deep Technical Analysis ## The Core Problem PostgreSQL's sequence infrastructure is monolithic: every sequence stores its state (last_value, is_called, log_cnt) in a si...
## Patch Committed and CF Entry Closed Fujita pushed the patch on 2025-05-14, confirming the fix is now in the tree. He did not extend the test coverage beyond his v2 patch (i.e., Zhenwei Shang's sug...
## What's new in this round Michael Paquier has completed a substantive technical review of the fix itself — the first independent expert review the thread has been waiting for since the fix was prop...
## What's New in This Round This round contains only two messages: Ishii adding pgsql-hackers to the CC (a procedural action with no technical content), and chenloveit's reply which introduces a **ne...
## Fujii Masao's Technical Review of v1 Patch Fujii Masao (masao.fujii@gmail.com) provided a detailed review on 2026-05-11, expressing general agreement with the PG_TRY/PG_CATCH direction but identif...
No substantive technical progress.
## Incremental Update: Amit Kapila Responds, Pushes Back on Documentation Need ### What's New Amit Kapila has responded to the original thread with a counterargument that significantly reframes the ...
No substantive technical progress.
No substantive technical progress.
## v3: Resolving the same-GUC empty-assignment edge case Shin's v3 directly addresses the open problem identified by Fujii at the end of the v2 review cycle — the case where a user sets and then clea...
No substantive technical progress.
## New Activity: Ashutosh Bapat Weighs In — Argues *Against* the ReleaseSysCache Fix The only new message is from Ashutosh Bapat, who provides a surprising counter-argument to the one remaining techn...
## Incremental Update: v2 Patch Submitted Evan Li has responded to Álvaro Herrera's feedback and submitted a v2 patch that follows the suggested direction: replacing the `StringInfo` usage with a pur...
## Incremental Update: v3 Patch — GUC Encoding Reversal and Naming Changes ### Key Development: Paquier Abandons the Separate GUC Integer Encoding The most significant change in this round is Michae...
## Incremental Update: v2 Patch Posted (Bug Fix Only) The v2 posting is a minor bug-fix revision with no design changes. The substantive new information is minimal. ### What's New **UBSan-detected ...
## New Issue Raised: Nested Quoting in Error Messages After the patch was committed, Peter Smith identified a quoting anomaly in the committed code. The error message templates use hardcoded double q...
## New in this round: Hou surfaces a concrete concurrency-safety gap in auto-maintenance, and Tomas dismisses it as a rare-case concern ### Hou's new technical argument: visibility gap during concurr...
No substantive technical progress.
No substantive technical progress.
## Incremental Update: Minor Editorial Feedback on Release Announcement Draft Two new messages have appeared since the initial solicitation. The thread remains **purely administrative** with no techn...
## Incremental Update: Ashutosh Bapat responds to Peter Eisentraut's concerns Ashutosh's reply addresses the two specific blockers Peter raised in his previous message: ### 1. Patch Application Issu...
## Incremental Update: Concurrency Concern Resolved ### Key Development Ashutosh Bapat addressed Peter Eisentraut's concurrency/locking concern — the most substantive open issue from the prior analy...
## Round Update: v10 and v11 — Snapshot registration fix and trigger policy reversal ### v10: Snapshot registration for the error table's EState (jian he, May 11) jian he identified a correctness co...
## New in this round: Pyhalov stress-tests Korotkov's v4, finds five concrete bugs/regressions — reveals that the IMMUTABLE-only tightening came at the cost of dropping safety checks that were load-b...
## Incremental Update: Yugo Nagata's Detailed Review of v2 Patch (2026-05-12) Yugo Nagata provides a focused code-level review of the v2 patch with three specific technical concerns. No new participa...
## New Activity: Peter Smith Review and Nisha's Response ### New Reviewer Engagement Peter Smith (smithpb2250@gmail.com) has entered the review, apparently questioning whether the patch is still val...
## First Community Review: Matthias van de Meent Provides Detailed Technical Feedback The thread's first substantive community response has arrived from Matthias van de Meent, an experienced nbtree ...
## Incremental Update: Reviewer Feedback from Ashutosh Bapat Ashutosh Bapat (a committer/reviewer familiar with SQL/PGQ internals) has responded with concrete review feedback on the patch. No new pat...
## Round 3: Author Responds with v2/v3 Patches; New Bugs Surface The author (Jian Universality) has responded to both Jim Jones's and Zsolt Parragi's prior reviews with two rapid patch iterations (v...
## Incremental Update — 2026-05-12 ### Summary The two new messages are brief acknowledgments with no new technical arguments, no new patches, and no design changes. The thread has moved to **Ready ...
No substantive technical progress.
## Incremental Update: Thread Progress Since Last Analysis ### Summary of New Activity The thread has moved from design debate to **pre-commit finalization**. Two new participants surfaced specific ...
## New Developments in This Round This round contains a mix of editorial corrections and one substantively important meta-discussion about release-note inclusion criteria. ### Editorial Corrections ...
## New Review from Masahiko Sawada (Committer) Masahiko Sawada (sawada.mshk@gmail.com) has entered the thread with a substantive review dated 2026-05-12, raising four distinct points that challenge o...
## Incremental Update: Thread Response and Resolution Direction ### Summary The thread received responses from Michael Paquier and Tom Lane, both pushing back on documenting the operator-backing fun...
## v4 and v5: Responding to Review, New Bugs Found, Architectural Refinement Two revision cycles (v4 and v5) land in quick succession, resolving most of the v3 review items while surfacing new imple...
## New in this round: B7 recursive-CTE rejection lands as patches, README.rpr enhancements, and a quick review cycle Three substantive developments since the last analysis: ### 1. Ishii posts a READ...
No substantive technical progress.
## New Technical Substance from Ashutosh Bapat Ashutosh Bapat provides a substantive architectural review that reframes the fix from "permanent rejection" to potentially "temporary limitation," and r...
## Ashutosh Bapat Challenges the Fundamental Premise of the Patch The first review response has arrived, and it **questions whether the bug being fixed actually exists**. ### Core Technical Objectio...
## Incremental Update: Shveta Malik's Detailed Code Review of Patch 003 This round consists of two messages from Shveta Malik providing a thorough code-level review of patch 003 (the core dependency...
## Incremental Update: Patch Moving Toward Commit ### Summary Fujita has taken ownership of the patch, produced an updated version (v2) with expanded test coverage, and signaled intent to push. Ayus...
# Update: Patch Committed Peter Eisentraut committed the fix on 2026-05-13. His message is a terse "committed" — no further technical discussion, no revisions requested, no objections raised. This c...
## Round 3: Patch committed, new issue raised about GiST clustering semantics in REPACK ### Key Development: v3 pushed by Álvaro Álvaro Herrera took v3, made one further optimization (computing the ...
## Incremental Update: Peter Eisentraut responds, discussion converges on comment-only fix ### Summary of New Exchange Peter Eisentraut responds to Haas's "Thoughts?" solicitation with a substantive...
## New: External Review Identifies Correctness Bug in Bound Propagation Zsolt Parragi (Percona) provides the first external review of the patch, raising two significant issues — one a potential **cor...
No substantive technical progress.
No substantive technical progress.
## Patch Arrives: `insert_pulled_up_sublink_join` Implementation The key development since the last analysis is that Lepikhov has posted the **concrete patch** implementing the structural fix he des...
## New in this round: Jian revisits memory context, Paul declines, and Nathan finds a segfault with virtual generated columns ### Jian's counter-proposal on memory context (rejected) Jian responded...
## New Developments: Reproduction of db-specific Snapshot Bug & Decision Point Reached The thread has advanced significantly since the last analysis. The core bug causing the db-specific snapshot fai...
## Incremental Update: Bug Reports on DDL Interactions with Join Statistics ### Summary Jian He contributed a detailed review identifying **four concrete bug cases** where DDL operations (ALTER COLU...
## Incremental Update: Rounds since prior analysis ### Summary Three new messages advance the thread on two fronts: (1) Dolgov pushes back on Cary Huang's suggestion to elide rows on `NID_undef`, ci...
## Incremental Update: v1 → v2 Patch Evolution and Review Convergence ### Patch v1 (2026-05-12) Junwang posted v1 as an attachment (resolving the earlier corporate-security friction that prevented a...
## Round Update: New Schema Column Proposal, ALTER TABLE Protection Gaps, Publication Leakage via Partitioning, and Amit Rules on `conflict_id` This round introduces one new participant (Shlok Kyal),...
# Technical Analysis: Adding TAP Tests for contrib/oid2name ## Core Problem The `contrib/oid2name` utility in PostgreSQL is a command-line tool that resolves OIDs (Object Identifiers) to human-read...
# Analysis: Are Extended Statistics Intentionally Not Propagated to Partitions? ## Core Problem This thread raises a fundamental architectural question about how PostgreSQL's extended statistics sy...
# SUBSCRIPTION SERVER ALTER/DROP Operations Stuck When User Mapping Is Dropped ## Core Problem This thread exposes a dependency management gap in PostgreSQL's new `CREATE SUBSCRIPTION ... SERVER` fe...
# Deep Technical Analysis: Hashed ScalarArrayOpExpr Equality Semantics ## Core Problem This thread surfaces a subtle but architecturally significant semantic gap in PostgreSQL's hashed evaluation p...
# SQL/JSON JSON_TABLE PLAN Clause — Technical Analysis ## Core Problem The SQL/JSON standard defines a `PLAN` clause for `JSON_TABLE()` that controls how multiple NESTED paths are joined together wh...
# Documentation Patch: standard_conforming_strings Dump/Restore Incompatibility in PostgreSQL 19 ## Core Problem PostgreSQL 19 made a significant backward-compatibility-breaking change via commit 4...
# Deep Technical Analysis: Improve pg_stat_statements Scalability ## The Core Problem pg_stat_statements is PostgreSQL's most widely deployed extension for query performance monitoring, yet it suff...
# Technical Analysis: Migration of pg_commit_ts Directory During pg_upgrade ## Core Problem PostgreSQL's `pg_upgrade` utility does not migrate the `pg_commit_ts` directory when upgrading a cluster....
# Fix pg_stat_statements Display of Normalized FETCH Counts ## Core Problem This thread addresses a subtle behavioral inconsistency in `pg_stat_statements` (PGSS) related to how normalized query te...
# Incorrect Checksum in Control File with EXEC_BACKEND Builds ## Core Problem PostgreSQL's `pg_control` file is a critical data structure that stores database cluster state information (checkpoint ...
# Bypassing Cursors in postgres_fdw to Enable Parallel Plans ## The Core Problem PostgreSQL's `postgres_fdw` uses SQL-level cursors (`DECLARE CURSOR` / `FETCH`) to retrieve data from remote servers...
# Proposal: Adding Compression of Temporary Files in PostgreSQL ## The Core Problem PostgreSQL's query executor spills intermediate results to temporary files when `work_mem` is exhausted. This hap...
# Technical Analysis: Fix Infinite Recursion When Foreign Table References Itself ## The Core Problem When a foreign table is created using `postgres_fdw` with a loopback server configuration that ...
# Technical Analysis: Add psql Tab Completion Support for FOR PORTION OF ## Core Problem PostgreSQL's temporal tables feature introduces the `FOR PORTION OF` clause, which is used in `UPDATE` and `...
# Feature: DNS SRV Record Discovery for libpq ## The Core Problem PostgreSQL's client library (libpq) currently requires clients to know the exact hostnames and ports of database servers at connect...
# Technical Analysis: libpq Address Iteration on target_session_attrs Mismatch ## Core Problem When libpq resolves a hostname to multiple IP addresses (via DNS A records), and a TCP connection succ...
# Add \pset Options for Boolean Value Display ## Core Problem PostgreSQL's `psql` client displays boolean values as the single characters `t` and `f`, which are the wire-format representations from...
# Technical Analysis: xact_rollback Spikes from Logical Walsender Exit ## Core Problem PostgreSQL's logical replication decoding pipeline has a subtle interaction with the database statistics subsy...
# PostgreSQL 19 Beta 1 Release Date Announcement ## Overview This is a release-management coordination message from Jonathan Katz announcing the planned release date for PostgreSQL 19 Beta 1. While...
# Technical Analysis: REPACK Decoding Worker Leak on FATAL Exit ## The Core Problem This thread addresses a resource leak bug in PostgreSQL's `REPACK (CONCURRENTLY)` infrastructure where a forced b...
# Technical Analysis: psql Tab Completion Missing IO Option for EXPLAIN ## Core Problem When commit `681daed9316` introduced `EXPLAIN (IO)` as a new boolean option in PostgreSQL, the corresponding ...
# Plug-in Coverage Hole for pglz_decompress() ## Core Problem This thread addresses a **test coverage gap** in PostgreSQL's built-in LZ compression/decompression implementation (`pg_lzcompress.c`),...
# Fix Unsafe PlannedStmt Access in pg_stat_statements ## Core Problem In PostgreSQL's `pg_stat_statements` extension, the `pgss_ProcessUtility()` hook has a well-documented invariant: after calling...
# Fix jsonpath .split_part() to Honor Silent Mode ## Core Problem PostgreSQL's jsonpath execution engine has a well-established contract: when `silent => true` is passed to jsonpath query functions...
# Technical Analysis: Use-After-Free in Property Graph Orphan Static Lists on Transaction Abort ## Overview This thread presents a short-lived bug report that was ultimately retracted. The submitte...
# Import Statistics in postgres_fdw: Deep Technical Analysis ## Core Problem When PostgreSQL performs `ANALYZE` on a foreign table managed by `postgres_fdw`, it must collect a representative sample...
# synchronized_standby_slots Behavior Inconsistent with Quorum-Based Synchronous Replication ## Core Problem PostgreSQL's `synchronized_standby_slots` GUC, introduced to support logical replication...
# Technical Analysis: Fix psql Tab Completion for REPACK Boolean Options ## Core Problem The psql tab-completion system in PostgreSQL has a bug in how it matches parenthesized boolean options for t...
# Analysis: DuckDB's Extensible Parser as Inspiration for PostgreSQL ## Core Problem PostgreSQL's SQL parser is monolithic and tightly coupled to the server's grammar definition (`gram.y`). This ma...
# Technical Analysis: Adding `last_execution_start` to pg_stat_statements ## The Core Problem `pg_stat_statements` is PostgreSQL's most widely-used monitoring extension, yet it lacks a fundamental ...
# FOR PORTION OF Should Reject GENERATED Columns ## Technical Problem This thread addresses a validation gap in PostgreSQL's `FOR PORTION OF` functionality — a feature related to temporal/period-aw...
# Technical Analysis: Replacing Obsolescent `egrep` with `grep -E` in PostgreSQL Build Tools ## Core Problem Modern GNU grep implementations have begun emitting warnings when the `egrep` command is...
# Technical Analysis: Fix errhint Messages for REPACK (CONCURRENTLY) Restrictions ## Core Problem This patch addresses a cosmetic but user-facing consistency issue in PostgreSQL's error hint message...
# Avoid Orphaned Object Dependencies in PostgreSQL: Deep Technical Analysis ## The Core Problem PostgreSQL's dependency tracking system (`pg_depend`) can develop orphaned entries when concurrent DD...
# Fix SPLIT PARTITION Bound-Overlap Bug and Related Improvements ## Core Problem: Silent Partition Bound Corruption The thread reports a critical correctness bug in PostgreSQL's `ALTER TABLE ... SP...
# Technical Analysis: `pg_current_vxact_id()` — Exposing Virtual Transaction IDs via SQL ## Core Problem PostgreSQL assigns every backend a **Virtual Transaction ID (VXID)** — a lightweight identifi...
## Incremental Analysis: Rounds 2–7 (2026-05-11 to 2026-05-14) ### Summary The thread shifts from patch development to **evaluation methodology debate and scoping decisions**. No new patch version ...
# Remove Invalid SS2/SS3 Handling from EUC-KR Routines ## Core Problem PostgreSQL's EUC-KR encoding implementation carries vestigial SS2 (0x8E) and SS3 (0x8F) single-shift byte handling inherited f...
# Technical Analysis: Adding Lock Failure Details to PostgreSQL Logs (FOR UPDATE NOWAIT) ## Core Problem When PostgreSQL encounters a lock conflict with `FOR UPDATE NOWAIT`, the operation fails imm...
# Technical Analysis: Should IGNORE NULLS Cache Nullness for Volatile Arguments? ## Core Problem The thread raises a subtle correctness concern with PostgreSQL's implementation of `IGNORE NULLS` su...
# Improve Conflict Detection When Replication Origins Are Reused ## The Core Problem: Stale Origin IDs Causing Silent Conflict Misses This thread addresses a subtle but architecturally significant ...
# Technical Analysis: Add pg_stat_kind_info System View ## Core Problem PostgreSQL 17 introduced pluggable cumulative statistics via commit 7949d959458, allowing extensions to register custom stati...
# Vacuumlo Silent Data Loss with Domain-over-OID Columns ## Core Problem The `vacuumlo` utility — PostgreSQL's tool for removing orphaned large objects — has a fundamental blind spot in its column-...
# pgbench: Thread-Safety Bug in Verbose Error Messages ## Core Problem A thread-safety bug was discovered in pgbench's `printVerboseErrorMessages()` function. The function uses a **function-local `...
# Technical Analysis: Rebuilding CHECK Constraints After Generated Column SET EXPRESSION ## Core Problem When `ALTER TABLE ... ALTER COLUMN ... SET EXPRESSION` changes the generation expression of ...
# Experimental Patch for Terminating VACUUM Freeze Blockers ## The Core Problem: VACUUM Failsafe Cannot Overcome Horizon Blockers PostgreSQL's anti-wraparound VACUUM mechanism has a well-known arch...
No substantive technical progress.
## New in this round: v2 of the follow-up series (+0011) and Ishii's first substantive reply on B7 Two developments since the previous analysis: ### 1. Henson's v2 repost adds patch 0011 — standard-...
No substantive technical progress.
# COPY FROM with Row-Level Security: Bridging the Bulk-Load / Policy Enforcement Gap ## Background and Architectural Problem PostgreSQL's Row-Level Security (RLS) machinery is tightly coupled to the...
# Analysis: Reducing pg_stat_statements LWLock Contention (GSoC 2026) ## Architectural Context `pg_stat_statements` is the de facto standard query-performance telemetry extension in PostgreSQL. Its ...
## New in this round (single reply from Alexandre Felipe, 2026-05-10) Alexandre responds to Zsolt's IEEE-Inf/NaN critique. The message is substantive: it shifts from "fix this one case" to **enumerat...
## Overview Andrei Lepikhov proposes extending PostgreSQL's join planning to opportunistically generate **pre-sorted outer paths for NestLoop joins** when the outer relation's columns appear as a pre...
## Overview This short thread concerns a minor but architecturally interesting cleanup in `src/backend/replication/logical/tablesync.c`, specifically in the `copy_table()` function used by logical re...
## Thread Overview This is a single-message documentation-oriented thread raising a subtle but legitimate concern about the behavior of `CREATE PUBLICATION ... FOR ALL TABLES EXCEPT` (and related `EX...
## What's New ### Evan endorses Jeff's approach — position shift Evan Chao (the original patch author) explicitly concedes that Jeff Davis's alternative is "a better approach." This effectively ends ...
# Thread Analysis: Adjust error message to reflect the inheritance relationship ## Core Problem The thread raises a minor but legitimate user-experience issue in PostgreSQL's DDL error reporting for...
No substantive technical progress.
No substantive technical progress.
## What's New in This Round This round brings **two committers into the thread for the first time** (Peter Eisentraut and Tatsuo Ishii), which materially changes the social weight of the discussion —...
# Subquery Pull-Up vs. Join Collapse Limits: A Planner Search-Space Problem ## The Core Architectural Problem PostgreSQL's planner has long used two escape hatches — `from_collapse_limit` and `join_...
# Analysis: pg_bsd_indent / pgindent — Formatting of Multiline Comments ## Core Problem PostgreSQL's source tree has historically tolerated two common styles for multiline block comments: ```c /* T...
## New in this round: Alexander Korotkov takes over the patch, tightens shippability to IMMUTABLE, and fixes a real planner limitation around multi-foreign-table joins This is a significant round. A ...
## Dump Statistics Bug: Cross-Index Attribute Name Leakage in pg_dump ### Background and Architectural Context PostgreSQL 18 introduced the ability for `pg_dump` to dump and restore planner statisti...
## What's New in This Round The discussion has shifted decisively **away from Chao's v2 HINT-based compromise** toward two converging "do less" positions, with a new committer-level voice (David G. J...
# Analysis: Making NumericVar Storage Semantics Explicit ## Context and Architectural Background PostgreSQL's `numeric` type has two distinct representations that the code juggles constantly: 1. **...
# pg_createsubscriber: Cleanup Flag Handling Bug ## The Core Problem `pg_createsubscriber` is a utility that converts a physical standby into a logical replication subscriber. During this conversion...
# Deep Analysis: Random pg_upgrade 004_subscription Test Failure on drongo ## Core Problem: Windows STATUS_DELETE_PENDING Race in Relation Storage Creation The thread concerns a long-standing, flaky...
## Overview This is a single-message documentation report on pgsql-hackers rather than a full design discussion. Marcos points out that a set of underlying SQL-callable functions backing the `jsonb` ...
# Making ENUM Operators LEAKPROOF — Technical Analysis ## The Core Problem PostgreSQL's `LEAKPROOF` function attribute is a promise to the planner: the function will not leak information about its a...
# UPDATE/DELETE FOR PORTION OF on Updatable Views: Rewriter Assertion Failure and Server Crash ## Core Problem This thread reports a bug in PostgreSQL 19's temporal table feature — specifically the ...
No substantive technical progress.
# pg_dump Dependency Loop for PROPERTY GRAPH Objects ## Core Problem PostgreSQL's SQL/PGQ `PROPERTY GRAPH` feature (an emerging SQL:2023 standard construct) allows defining graph views over relation...
## Overview This is a single-message bug-report/patch proposal from Lakshmi addressing a misleading log message in PostgreSQL's **logical replication slot synchronization** subsystem — specifically i...
# Replication Slot Leak on Error in SQL-Callable Slot Functions ## The Core Problem PostgreSQL tracks the currently-acquired replication slot via a process-global variable `MyReplicationSlot` in `sr...
## What's New A single brief reply from **Daniel Gustafsson** (committer, and — as his self-deprecating "not sure how I could have missed that" implies — the original author of the buggy code, likely...
# Early Pruning for GRAPH_TABLE Path Generation (SQL/PGQ) ## Architectural Context SQL/PGQ (SQL Property Graph Queries), landed as a feature in PostgreSQL's SQL-standard graph query surface, is impl...
## Thread Overview: 2026-05-14 Release Announcement Draft This thread is an **administrative/release-management thread**, not a technical design discussion. Jonathan Katz, acting in his long-standing...
## Round 2: v2 patch posted, Alvaro joins with a micro-optimization Two substantive developments since the prior round: ### 1. Author (Evan Li) responds to Reshke and ships v2 - **On CFI**: Li conc...
## New in this round: Hou vs. Tomas on cascading-lock cost, and a clean feature split Two messages that sharpen — but do not resolve — the auto-maintenance-vs-declarative debate, plus an explicit arc...
No substantive technical progress.
# Ternary Reloption Type: Consolidating the "unset" Semantics ## The Architectural Problem PostgreSQL's reloption subsystem historically provided a small set of primitive types: `bool`, `int`, `real...
No substantive technical progress.
## Minimal Update: Amit Escalates, Requests Reproducer Only two short messages from Amit Kapila since the last analysis. No new technical arguments, no patches, no position shifts — but there is a su...
## New in this round (single message from Zsolt Parragi, 2026-05-08) Zsolt signs off on the NULL-handling fix ("new NULL handling looks good. Nice test!") — closing out correctness pitfall #3 from th...
# Analysis: "apt files missing for PG18" — Packaging/Infrastructure Report ## Nature of the Thread This is **not a pgsql-hackers technical development thread** in the traditional sense. It is a sing...
## New and Significant: Bug Scope Narrowed to v18 Regression The only substantive new information in this round is Richard Guo's post-commit clarification about the **historical scope** of the bug, w...
## New Discussion: Scope Creep Proposals and Pushback Five new messages introduce two tangential cleanup proposals on top of the already-approved `EndCopyFrom()` fix. Both are ultimately rejected as ...
No substantive technical progress.
## Thread Analysis: Disabling Heap-Only Tuples / `local_update_limit` / `COMPACT` ### The Architectural Problem PostgreSQL's HOT (Heap-Only Tuple) optimization is a cornerstone of MVCC update perfor...
# Whole-Row Var References and Virtual Generated Columns: A Semantic Leak in Index Predicates/Expressions ## The Core Problem Virtual generated columns (introduced in PG18) are not materialized in t...
# Missing Dependency Tracking for SQL/PGQ Labels and Properties ## Context: SQL/PGQ in PostgreSQL SQL/PGQ (Property Graph Queries) is the ISO/IEC 9075-16 standard extension that adds property-graph ...
No substantive technical progress.
## New in this round: First external tester reports "no pushdown observed" — author clarifies it's a cost-model artifact, not a bug Two new messages, and they add genuine technical content beyond the...
No substantive technical progress.
# GSoC 2026 Proposal: B-tree Index Bloat Reduction via Sibling Page Merging ## Context and Motivation PostgreSQL's B-tree (nbtree) implementation is well known for being asymmetric with respect to s...
## Core Problem The thread concerns a minor but semantically interesting bug in `pg_get_tablespace_ddl_internal()` (and by extension its sibling `pg_get_role_ddl_internal()`), both of which are relat...
# EXPLAIN (ANALYZE, WAITS): Per-Statement and Per-Plan-Node Wait Event Attribution ## Core Problem PostgreSQL has long exposed a backend's *current* wait event through `pg_stat_activity.wait_event_t...
# Analysis: Improving Visibility of Temporary Table Usage via pg_stat_database ## The Core Problem PostgreSQL's cumulative statistics system exposes rich observability for *regular* relations and fo...
# Extending EXISTS Sublink Pull-up to Handle JoinExpr Quals ## The Core Problem PostgreSQL's `convert_EXISTS_sublink_to_join()` (in `subselect.c`, invoked from `pull_up_sublinks_qual_recurse()`) tra...
## Overview This thread is a routine administrative announcement from Tom Lane (PostgreSQL core committer and long-time release manager) notifying the pgsql-hackers community that draft release notes...
# Analysis: Removal of Obsolete Comment in `AtEOXact_Inval` ## Core Issue This thread is a minor code hygiene cleanup, not a substantive architectural change. The proposal targets a stale documentat...
## Thread Overview: Documentation vs. API Layering for `errposition` This is a short but instructive thread about the distinction between a **low-level ereport auxiliary routine** and its **context-s...
# REPACK and WITHOUT OVERLAPS Replica Identity Indexes ## Context and Background This thread addresses a bug in the (hypothetical future) `REPACK` command when interacting with temporal tables that ...
# Analysis: Freeing BufFile Metadata in `BufFileClose()` and `BufFileAppend()` ## Core Problem `BufFile` is PostgreSQL's buffered-file abstraction layered on top of the virtual file descriptor (`Fil...
No substantive technical progress.
# Analysis: Adding `ssl_supported_groups` / `ssl_shared_groups` to `contrib/sslinfo` ## Core Problem & Motivation The `contrib/sslinfo` extension is PostgreSQL's in-band introspection surface for th...
No substantive technical progress.
## Overview This is a single-message bug report from Sven Klemm (TigerData, i.e. Timescale) identifying a correctness bug in `ParseVariableDouble()` in `src/bin/psql/variables.c`. The bug is narrow i...
No substantive technical progress.
## Support for 8-byte TOAST values, round two — Technical Analysis ### The Core Problem: TOAST OID Exhaustion PostgreSQL's TOAST (The Oversized-Attribute Storage Technique) mechanism stores large fi...
# Parallel Data Loading for `pgbench -i`: Technical Analysis ## Core Problem `pgbench -i` (initialization mode) is the canonical benchmark-setup workflow, and it has been single-threaded since incep...
## New Development: Submitter Pushes Back, Confirms CONCURRENTLY Mechanism cca5507 responds directly to Geier's objection with a concise technical rebuttal that partially confirms the prediction from...
## Thread Closure: Backpatch Committed The thread has reached its terminal state. Only two new messages since the last analysis, both administrative: 1. **Vignesh** (the original patch author, re-su...
# Trailing Comma Bug in postgres_fdw `fetch_attstats()` — Cross-Version Statistics Import ## Context and Architectural Background PostgreSQL 17 introduced the ability to import/export planner statis...
## New Developments: Deeper Review of db-specific Snapshots Reveals Multiple Flaws Since the revert discussion, Amit Kapila, Masahiko Sawada, and Antonin Houska did a fresh review pass on the db-spec...
## New Developments: Fail-Soft Patch Landed, Universal Builds Restored The third proposal from the prior analysis — making `pg_cpuid()` return zeros when no cpuid intrinsic is available — has now bee...
No substantive technical progress.
## New in this round: v12 — three small-but-principled review polish items from Evan, all accepted by Paul No design changes. v11 → v12 is a focused cleanup of the `ExecGetUpdatedCols` hunk driven en...
# postgres_fdw: Use COPY to speed up batch inserts — Technical Analysis ## The Core Problem `postgres_fdw` currently sends batched inserts to the remote server using a prepared `INSERT ... VALUES ($...
## New in This Round Richard Guo closed out the CaseExpr defect with a committed and **back-patched** fix. Two technically notable points beyond the prior analysis: ### 1. Precise Parse-Analysis Exp...
# Parallel INSERT SELECT take 2 — Deep Technical Analysis ## The Core Architectural Problem PostgreSQL's parallel query infrastructure was extended to handle the SELECT side of `INSERT ... SELECT` i...
## New Developments ### v3 posted by Evan Chao (2026-05-06) Evan accepted both review points and produced v3: - **Comment rewording**: Reframed the semantics of `GetSubscriptionConnInfo()` as an idem...
# pg_stat_io_histogram: Per-Bucket I/O Latency Distribution Tracking ## The Core Problem PostgreSQL's existing observability around I/O latency is coarse. `pg_stat_io` (introduced in PG16) tracks cu...
No substantive technical progress.
## What's new in this round One short message from Andrey Borodin — mostly a status update, but with two concrete technical signals worth recording. ### 1. Andrey implemented Michael's steer — with ...
## Core Problem `transformLockingClause()` in `src/backend/parser/analyze.c` is the parser-analyze stage routine responsible for validating `FOR UPDATE/FOR NO KEY UPDATE/FOR SHARE/FOR KEY SHARE` row-...
## What's New in This Round Two substantive developments since the prior analysis: ### 1. Laurenz confirms the PoC fixes the reported bug — but breaks on multi-character equivalence rules Laurenz t...
# Documentation Semantics: Durability Guarantees of the Logging Collector ## Core Problem A first-time contributor (Daniel) raised a documentation clarity issue that sits at an interesting intersect...
No substantive technical progress.
### New reviewer, new correctness bug: TABLESAMPLE defeats FK-based removal Alexandra Wang enters the thread with a v4 review that contributes one real bug and two minor process questions. The bug is...
No substantive technical progress.
## New in this round: a new reviewer, a real mutation bug, and a patch split ### New participant: Evan Li (li.evan.chao@gmail.com) Evan joins the thread with two concrete contributions and detailed ...
No substantive technical progress.
## New Round: First Reviewer Feedback — Coccinelle Approach Called Into Question Zsolt Parragi (Percona) provides the first substantive technical review, and it is pointed. The feedback is twofold: (...
## Core Problem: Redundant `fadvise64()` Calls in WAL Recovery Prefetcher PostgreSQL's recovery prefetcher (`xlogprefetcher.c`, introduced in PG15 via commit 3985b600 by Thomas Munro) scans ahead in ...
## New Activity: First Reviewer Engagement, Author Concedes Teardown Hunk ### What's new The thread got its first external reviewer (Junwang Zhao, `zhjwpku@gmail.com`), and the author (Amul Sul / "su...
## New Development: Geier Raises a Fundamental Objection David Geier (geidav.pg) has returned with a **much more substantive technical challenge** that potentially undermines the entire premise of th...
## Round Update: Ownership-Transfer Corner Case Crystallizes into a Policy Question; Two Real Bugs in v30 This round finally puts hard numbers on the ownership-transfer issue Dilip was still validati...
## Checkpoint Replication Slots Later — Technical Analysis ### The Core Problem During a PostgreSQL checkpoint, the `CheckpointGuts()` function performs a sequence of sub-operations that flush vario...
No substantive technical progress.
## What's New in This Round **Peter Eisentraut has finally weighed in**, and his response reframes the entire debate — not by picking between Ashutosh's and Michael's naming proposals, but by questio...
# Analysis: Bug in UPDATE/DELETE FOR PORTION OF with Inheritance Tables ## Background: Temporal DML and FOR PORTION OF PostgreSQL 18 (development tip at the time, referred to here as "19" by the rep...
## Core Problem: Broken 64-bit Atomic Read/Write on 32-bit x86 The immediate issue is a trivial typo in `src/include/port/atomics/arch-x86.h`: preprocessor checks reference non-existent macros `__i56...
## New in this round: Henson's 10-patch follow-up series on top of v47 Henson Choi posted a cleanup/polish series (0001–0010) implementing the [A]–[D] follow-up plan he had sketched on 2026-05-05, pl...
# Analysis: `io_min_workers > io_max_workers` Semantics in AIO Worker Pool ## Background and Architectural Context Commit `d1c01b79d4ae` ("aio: Adjust I/O worker pool automatically") is part of the ...
No substantive technical progress.
## New in this round: Nathan posts patch v3→v5 and floats a larger simplification agenda Nathan followed through with actual patches (v3, v4, v5 in rapid succession on 2026-05-07), fixing his own mis...
## Overview This thread is not a technical design discussion of PostgreSQL internals but rather a short policy/packaging discussion triggered by a user feature request. The OP proposes that installin...
## New Activity: Code Review Round on v3 Three new messages, two of which introduce substantive technical points. No design-level pushback on the v3 architecture — the discussion has shifted from "is...
## Core Problem: OpenSSL 4.0.0 API Const-Correctness Churn OpenSSL 4.0.0 shipped GA in April 2026 and — while not removing any APIs PostgreSQL currently relies on — tightened `const` qualifiers on a ...
# SLOPE: Planner Optimizations on Monotonic Expressions ## The Core Problem PostgreSQL's planner is conservative about deriving ordering guarantees from expressions built on indexed columns. Given a...
## New Developments: Bug Bisected, Patch Refined, Committed Three new messages close out the thread with concrete progress. The prior analysis correctly anticipated the fix shape (pattern 1: re-fetch...
## Summary This is a trivial cosmetic cleanup patch submitted against `src/backend/storage/ipc/waiteventset.c`. It is not an architecturally significant thread — it contains a single message with no ...
# Dmitry's Counter-Proposal: "Shifted Interval" as a Cheaper Alternative to Two-Pass Dmitry returns with a worked-out cost analysis that pushes back — gently — on Peter's two-pass design, and propose...
No substantive technical progress.
## What's New: Commit Deferred Due to Release Freeze This round is primarily **procedural/scheduling**, not technical. The patch is essentially ready, but the commit has been postponed. ### Key deve...
## New in this round: ChangAo pushes back on Robert's "management bot" constraint Only one new message since the prior analysis, but it is technically substantive — it challenges a key premise of the...
No substantive technical progress.
No substantive technical progress.
## What's New in This Round **The main patch set has been committed.** John Naylor pushed v6 (with additional wordsmithing applied during commit) on 2026-05-07. Ayush acknowledged with thanks; no fur...
## New in this round (Tomas' clarifying question, May 7 2026) Only one new message, and it's a pointed question rather than new technical content. Tomas Vondra asks Melanie to clarify her v2 claim ab...
## New Activity: Peter Pushes Back on the Patch The new round contains the first substantive disagreement in the thread. Peter Eisentraut, who had earlier handled the `vertexes`→`vertices` rename him...
## New Activity: Helper Generalization and Placement Refinements Since the prior analysis, the discussion has moved past the two-patch split (which is now implemented in v5) into a second round of AP...
# Assertion Failure in LATERAL GRAPH_TABLE with Multi-label Patterns ## Context: SQL/PGQ GRAPH_TABLE This thread concerns a bug in PostgreSQL's emerging SQL/PGQ (Property Graph Queries) implementati...
# Broken macOS Universal / Intel Builds After x86 CPU Feature Centralization ## Context and Architectural Background In the PostgreSQL 19 development cycle, two related pieces of work landed that co...
## Incremental Update — Nathan's May 6 follow-up Minimal substantive progress. Nathan reports two things: 1. **`rewrite_multixacts()` cleared**: after further examination, he believes the pg_upgrade...
## New Development: Scope of the Bug Expands Significantly Two new messages, and the second one materially changes the shape of this thread. ### Fabrízio posts v2 (brief) Fabrízio acknowledges Zsol...
## What's New: Release Coordination, Not Technical Substance The new messages are entirely about **commit choreography**, not new technical ground. The patch itself is unchanged in substance — only t...
## Round Update: Schema Rename Policy, Permissions Edge Cases, and Minor Cleanup This round is largely **consolidation** rather than new architectural ground. The substantive items: ### 1. Schema Re...
## Update: `io_method='worker'` is not a reliable workaround Feike Steenbergen corrects his earlier observation. Switching `io_method` from `io_uring` to `worker` only *reduces the frequency* of the ...
## New Development: Root Cause of `dikkop` Failures Identified — A 22-Year-Old Thread Fallback Bug Andrew Dunstan has diagnosed the secondary buildfarm failures exposed by the original NULL-connectio...
# Assertion Failure When Raising Errors from XACT_EVENT_PREPARE Callback ## Core Problem The reporter (Kirill Reshke, working on a sharding extension for PostgreSQL — pg-sharding) is building a two-...
## New in this round (Melanie's v2, May 6 2026) Melanie posted v2 patch sets (for PG18 and PG19/master) responding to Andres' review. Most of the message is "done, done, done" on minor review points,...
# Randomizing B-Tree Split Locations to Defeat "Waves of Misery" ## The Core Problem This thread addresses a well-documented pathology in B-Tree indexes known as **"Waves of Misery"** (Glombiewski, ...
No substantive technical progress.
## New review from Zsolt Parragi (Percona) — v5 code review A new reviewer, Zsolt Parragi (Percona), posted a detailed code-level review of v5. This is the first substantive review feedback from some...
## New in this round: Henson Choi's line-by-line review A single new message from Henson Choi (assam258@gmail.com) — the same reviewer who earlier delivered the 96.8% coverage report. This round is a...
## Core Problem: Allocator/Deallocator Mismatches in Frontend Code PostgreSQL's frontend utility code (`src/fe_utils`, `src/bin`, libpq, etc.) exposes two parallel families of memory management wrapp...
### New: Tender Wang raises an ordering/iteration issue in `remove_useless_joins()` Tender Wang follows up on his own earlier review with a distinct, previously-unmentioned observation: inner-join re...
No substantive technical progress.
## Overview This thread is a short buildfarm diagnostic exchange concerning intermittent (~5% rate) segmentation faults in ECPG's threaded regression tests on the `dikkop` FreeBSD animal. The failure...
## New Round: Zsolt Parragi's Crash/Correctness Report Zsolt Parragi (Percona) contributes the first external reproduction testing of the v20 patch and surfaces **four concrete bugs**, two of which a...
## New in this round: v8 crash, v9 fix, and a minor comment nit ### Peter Eisentraut surfaces a regression Peter reported that the patch (v8) **crashes the server** under the `injection_points/isola...
## What's New in This Round Michael Paquier has moved from narrow test-placement feedback into the substantive naming/identity debate, and has **committed a partial fix while pushing back on two poin...
## Core Problem: Inconsistent Role Recursion Semantics in ADMIN Checks This thread exposes a subtle but real semantic inconsistency introduced (or at least surfaced) by commit `ce6b672e44` (v16), whi...
No substantive technical progress.
No substantive technical progress.
## What's New in This Round Three messages, and one of them is technically substantive: **Andres posted a rough prototype** demonstrating his fcinfo-context approach concretely, ending the abstract d...
## What's new in this round Two substantive developments, both about **test infrastructure packaging** rather than the fix itself: ### 1. Andrey's v2 test cleanup (and explicit "fix unchanged" state...
# Technical Analysis: Releasing FK Fast-Path `pk_slot` Buffer Pin Promptly ## Architectural Context Commit `b7b27eb41a5` introduced a batched fast-path mechanism for foreign key referential integrit...
## Core Problem PostgreSQL 18 introduced **virtual generated columns** (commit 83ea6c5), where the column's value is computed on read rather than stored. This provides a "free" schema refactoring pri...
## Core Problem: Stale Wait State After Subtransaction Abort in WAIT FOR LSN ### Background: WAIT FOR LSN Infrastructure `WAIT FOR LSN` is a relatively recent SQL-level feature (implemented in `xlog...
## Core Problem: Two Distinct Race Conditions on pg_control This thread starts as a narrowly scoped bug report but evolves, over six years, into a much deeper architectural discussion about how Postg...
# ReadStream Look-ahead Exhausts Local Buffers with High `effective_io_concurrency` ## The Core Problem PostgreSQL 18 introduced the ReadStream API (src/backend/storage/aio/read_stream.c) as the uni...
# Join Statistics for the PostgreSQL Planner: Closing the Cross-Table Correlation Gap ## The Architectural Problem PostgreSQL's cardinality estimator operates under an implicit independence assumpti...
# Technical Analysis: `ON_ERROR table` — Saving COPY FROM Errors to a Table ## Background and Motivation PostgreSQL 17 introduced the `ON_ERROR ignore` option for `COPY FROM`, allowing rows that fai...
## Summary This thread is a small but illustrative bug-fix discussion concerning a **misleading error message** emitted by PostgreSQL's referential-integrity machinery (`ri_LockPKTuple`) and the row-...
# WAIT FOR LSN: Built-in Read-Your-Writes Consistency for Standbys ## The Core Problem PostgreSQL's streaming replication provides eventual consistency on standbys, but applications needing **read-y...
## Cascading Standby Fails to Reconnect After Archive-Recovery Fallback ### The Core Problem This thread addresses a long-standing (since PostgreSQL 9.3) bug in cascading streaming replication that ...
# Exit walsender before confirming remote flush in logical replication ## The Core Problem PostgreSQL's walsender has historically refused to shut down until it both (a) drained all pending WAL from...
## Overview This thread is not about a PostgreSQL code defect per se — it documents a long-running, collective struggle to keep PostgreSQL's **code coverage reporting pipeline** (`make coverage-html`...
# Analysis: Moving recovery target conflict detection out of GUC assign hooks ## The architectural problem PostgreSQL's GUC subsystem (`src/backend/utils/misc/guc.c`) is built around a strict contra...
## Core Problem `pg_dump` emits a spurious `OVERRIDING SYSTEM VALUE` clause in generated `INSERT` statements for tables that no longer have an identity column but once did. The clause is technically ...
## Core Problem: A Race Between `ProcSignalInit` and `EmitProcSignalBarrier` This thread uncovers a long-latent but recently-unmasked race condition in PostgreSQL's ProcSignalBarrier (PSB) machinery ...
## Inner Join Removal via Foreign Keys — Architectural Analysis ### The Core Problem PostgreSQL's planner has long supported *left* join removal: if the RHS of a LEFT JOIN is guaranteed to match at ...
## Thread Overview This is a GSoC 2026 introductory email from a student contributor (Salma El-Sayed) announcing her project to tackle B-tree index bloat reduction via page merging. No community repl...
## Core Problem: Stale `Relation` Pointer in Sequence Sync Worker The bug resides in the logical replication **sequence synchronization** code path (`copy_sequences()` and its helper `get_and_validat...
## Thread Overview This thread nominally concerns Bruce Momjian's first draft of the PostgreSQL 19 release notes (212 feature entries, versus a recent average of 200), but it quickly bifurcates into ...
## Overview This thread proposes adding observability into PostgreSQL's Virtual File Descriptor (VFD) cache — a per-backend LRU-managed cache of open OS file descriptors bounded by `max_files_per_pro...
# CREATE OR REPLACE MATERIALIZED VIEW — Technical Analysis ## Core Problem Materialized views in PostgreSQL occupy an awkward middle ground in the object taxonomy: they carry a query definition like...
# pg_rewind and Diverging Timelines with Identical TLI Numbers ## The Core Problem PostgreSQL's timeline identifier (TLI) is a monotonically increasing integer that gets bumped every time a standby ...
# Analysis: Adding errdetail() with PID/UID of Signal Sender ## Core Problem and Motivation When a PostgreSQL backend is terminated via SIGTERM (e.g., from `pg_terminate_backend()`, `pg_ctl stop`, o...
## Core Problem: Initialization Ordering Bug with PROCSIGNAL_BARRIER_UPDATE_XLOG_LOGICAL_INFO This thread addresses a subtle but real race condition in PostgreSQL 19devel backend initialization, intr...