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f61d6b0e13
Previously, in the path for non-deterministic collations, the code
assumed that bsize==rsize. That assumption seems to be true for ICU,
and all non-deterministic collations are ICU, so it's not known to be
an actual bug.
The only known place where bsize may not equal rsize is in the libc
provider, where strxfrm() can return an upper bound of the size needed
to store the result. That means the initial call to determine the
buffer size (with dest==NULL, n==0) could return a larger number than
the actual call with an adequate dest buffer. That's OK, because libc
locales are always deterministic.
Commit 679c5084cf partially fixed the assumption, but missed this
part. Fix it, and add a more prominent documentation note.
Reviewed-by: Haibo Yan <tristan.yim@gmail.com>
Discussion: https://postgr.es/m/CABXr29Hb31nkj1g2Jmk+1BhAm=3ecGs_pWy4tU++j8CQBnbMxQ@mail.gmail.com
Backpatch-through: 16
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/.