11aed8d19c
The operators for array_eq, record_eq, range_eq, and multirange_eq
are all marked oprcanhash, but there's a pitfall: their hash functions
can fail at runtime if the contained type(s) are not hashable.
Therefore, the planner has to check hashability of the contained types
before deciding it can use hashing in these cases. Not every place
had gotten this memo, and noplace at all had considered the issue
for ranges or multiranges. In particular we could attempt to use
hashing for a ScalarArrayOpExpr on a container type when it won't
actually work, leading to "could not identify a hash function ..."
runtime failures.
For the most part we should fix this in the lookup functions provided
by lsyscache.c, to wit get_op_hash_functions and op_hashjoinable.
But there's a problem: get_op_hash_functions is not passed the input
data type it would need to check. We mustn't change the API of that
exported function in a back-patched fix, and even if we wanted to,
its call sites in the executor mostly don't have easy access to the
required data type OID. Fortunately, the executor call sites don't
actually need fixing, because it's expected that the planner verified
hashability before building a plan that requires it. Therefore,
leave get_op_hash_functions as-is and invent a wrapper function
get_op_hash_functions_ext that does the additional checking needed
in the planner's uses.
We also need to fix hash_ok_operator (extending the fix in
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| src | ||
| .abi-compliance-history | ||
| .cirrus.star | ||
| .cirrus.tasks.yml | ||
| .cirrus.yml | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| aclocal.m4 | ||
| configure | ||
| configure.ac | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| meson.build | ||
| meson_options.txt | ||
| 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/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/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/.