Technical Analysis: Fix Doubled-Word Typos and Punctuation in Code Comments

Problem Statement

This is a straightforward code quality patch that addresses three instances of doubled-word typos and one missing punctuation mark across PostgreSQL's source tree. While technically trivial, these kinds of fixes contribute to codebase readability and maintainability — particularly important for a project where comments serve as critical documentation for future developers navigating complex subsystems.

Specific Fixes

1. src/backend/utils/adt/pg_dependencies.c — Extended Statistics Dependency Handling

Before: "ensure that there there are no matches" After: "ensure that there are no matches"

This comment lives in the dependencies_object_end() function, which is part of the JSON deserialization path for functional dependency statistics (introduced as part of extended statistics in PG10+). The function processes parsed dependency objects and validates attribute numbers. The doubled "there" is a simple editing artifact.

2. src/port/pqsignal.c — Signal Handling Portability Layer

Before: "as it it needs to take single argument only" After: "as it needs to take a single argument only"

This fix is in the Windows-specific signal forwarding code within pqsignal(). The comment explains why signals are routed through a wrapper handler on Windows — the native Windows signal API expects a handler with a single argument. The fix removes the doubled "it" and adds the missing article "a" for grammatical correctness.

3. doc/src/sgml/stylesheet-html-common.xsl — Documentation Build Stylesheet

Before: "because we emit it it otherwise gets pushed down" After: "because we emit it, it otherwise gets pushed down"

This is the most interesting fix linguistically. Unlike the other two which are simple doubled-word removals, this one recognizes that both instances of "it" are intentional — they refer to different antecedents (the first "it" is the object of "emit", the second "it" is the subject of "gets pushed down"). The fix correctly adds a comma to separate the two clauses rather than removing a word, demonstrating careful reading of the comment's semantic intent. The comment documents a workaround for xmlns:xlink namespace handling in the DocBook-to-HTML transformation pipeline.

Patch Characteristics

• Risk level: Essentially zero — all changes are within comments or documentation XML comments
• Testing: The author explicitly notes no tests were run, which is appropriate for comment-only changes with no behavioral impact
• Preparation: Applied against master branch

Disposition

Michael Paquier (a PostgreSQL committer with broad responsibility for code quality and minor fixes) acknowledged the patch and indicated he has queued it for later application. This is typical handling for trivial-but-correct comment fixes — they are often batched or committed during quieter periods or as part of larger cleanup efforts.

Broader Context

PostgreSQL has a long tradition of maintaining high comment quality. Typo-fix patches are regularly accepted, though they are low-priority relative to feature work. The project periodically does bulk typo-fix commits (often attributed to tools like codespell or manual review). Individual submissions like this one are welcomed but typically held until a convenient commit window.