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Alexander Korotkov 2349b106b6 postgres_fdw: don't push down non-relabeling ArrayCoerceExpr 
Commit 62c3b4cd9d taught postgres_fdw to push down ArrayCoerceExpr, but
foreign_expr_walker() only recursed into the input array expression and
never examined elemexpr, the per-element conversion that gives the
coercion its semantics.  deparseArrayCoerceExpr() then shipped a bare
"arg::resulttype" cast, or nothing at all for an implicit-format
coercion, leaving the remote server to re-resolve the element conversion
against its own catalogs and session state.

This produced wrong results or remote errors whenever the element
conversion was not a plain relabeling, and it was inconsistent with how
postgres_fdw treats the equivalent scalar coercions.  An ArrayCoerceExpr
was shipped even when its elemexpr was a cast function (whose
shippability was never checked), a CoerceViaIO (e.g. float8out or
byteaout, which depend on extra_float_digits / bytea_output that
postgres_fdw sets differently on the remote session), or a
CoerceToDomain (which pushes domain enforcement to the remote catalog).
By contrast, a scalar CoerceViaIO is never shipped, and a scalar cast
function is shipped only when it is shippable.

Restrict pushdown to element coercions that are a plain relabeling, that
is, elemexpr is a RelabelType or a bare CaseTestExpr.  Any other element
coercion is now evaluated locally.  This keeps the common
binary-coercible case pushed down, including "col = ANY($1)" with a
varchar[]-to-text[] relabeling, which is the case 62c3b4cd9d set out to
optimize.

Pushing down shippable element cast functions, to reach parity with the
scalar case, is left out here for simplicity.

Reported-by: Noah Misch <noah@leadboat.com>
Discussion: https://postgr.es/m/20260711024234.43.noahmisch%40microsoft.com
Backpatch-through: 19
2026-07-15 01:39:52 +03:00
.github ci: Improve ccache handling 2026-06-08 15:26:47 -04:00
config Update config.guess and config.sub 2026-04-09 11:26:14 +02:00
contrib postgres_fdw: don't push down non-relabeling ArrayCoerceExpr 2026-07-15 01:39:52 +03:00
doc Fix data checksum progress counter initialization 2026-07-10 22:33:47 +09:00
src Translation updates 2026-07-13 12:03:36 +02:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add previous 2 commits to .git-blame-ignore-revs. 2026-06-29 15:33:52 -04:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Stamp 19beta2. 2026-07-13 16:03:24 -04:00
configure.ac Stamp 19beta2. 2026-07-13 16:03:24 -04:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_19_STABLE to its new status as a stable branch 2026-06-29 16:39:23 -04:00
meson.build Stamp 19beta2. 2026-07-13 16:03:24 -04:00
meson_options.txt Revert "Add built-in fuzzing harnesses for security testing." 2026-04-10 09:53:58 -04:00
README.md Adapt REL_19_STABLE to its new status as a stable branch 2026-06-29 16:39:23 -04:00

README.md

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/19/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/19/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/.