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mirror of https://github.com/postgres/postgres.git synced 2025-05-28 05:21:27 +03:00
Tom Lane 9d6d8d7049 Fix checking of index expressions in CompareIndexInfo().
This code was sloppy about comparison of index columns that
are expressions.  It didn't reliably reject cases where one
index has an expression where the other has a plain column,
and it could index off the start of the attmap array, leading
to a Valgrind complaint (though an actual crash seems unlikely).

I'm not sure that the expression-vs-column sloppiness leads
to any visible problem in practice, because the subsequent
comparison of the two expression lists would reject cases
where the indexes have different numbers of expressions
overall.  Maybe we could falsely match indexes having the
same expressions in different column positions, but it'd
require unlucky contents of the word before the attmap array.
It's not too surprising that no problem has been reported
from the field.  Nonetheless, this code is clearly wrong.

Per bug #18135 from Alexander Lakhin.  Back-patch to all
supported branches.

Discussion: https://postgr.es/m/18135-532f4a755e71e4d2@postgresql.org
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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.

PostgreSQL has many language interfaces, many of which are listed here:

	https://www.postgresql.org/download/

See the file INSTALL for instructions on how to build and install
PostgreSQL.  That file also lists supported operating systems and
hardware platforms and contains information regarding any other
software packages that are required to build or run the PostgreSQL
system.  Copyright and license information can be found in the
file COPYRIGHT.  A comprehensive documentation set is included in this
distribution; it can be read as described in the installation
instructions.

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