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Tomas Vondra db14dcdec6 Lookup the correct ordering for parallel GIN builds
When building a tuplesort during parallel GIN builds, the function
incorrectly looked up the default B-Tree operator, not the function
associated with the GIN opclass (through GIN_COMPARE_PROC).

Fixed by using the same logic as initGinState(), and the other place
in parallel GIN builds.

This could cause two types of issues. First, a data type might not have
a B-Tree opclass, in which case the PrepareSortSupportFromOrderingOp()
fails with an ERROR. Second, a data type might have both B-Tree and GIN
opclasses, defining order/equality in different ways. This could lead to
logical corruption in the index.

Backpatch to 18, where parallel GIN builds were introduced.

Discussion: https://postgr.es/m/73a28b94-43d5-4f77-b26e-0d642f6de777@iki.fi
Reported-by: Heikki Linnakangas <hlinnaka@iki.fi>
Backpatch-through: 18
2026-01-26 20:05:17 +01:00
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PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.