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Commit 1e7fe06c10c0a8da9dd6261a6be8d405dc17c728 changed pg_mbstrlen_with_len() to ereport(ERROR) if the input ends in an incomplete character. Most callers want that. text_substring() does not. It detoasts the most bytes it could possibly need to get the requested number of characters. For example, to extract up to 2 chars from UTF8, it needs to detoast 8 bytes. In a string of 3-byte UTF8 chars, 8 bytes spans 2 complete chars and 1 partial char. Fix this by replacing this pg_mbstrlen_with_len() call with a string traversal that differs by stopping upon finding as many chars as the substring could need. This also makes SUBSTRING() stop raising an encoding error if the incomplete char is past the end of the substring. This is consistent with the general philosophy of the above commit, which was to raise errors on a just-in-time basis. Before the above commit, SUBSTRING() never raised an encoding error. SUBSTRING() has long been detoasting enough for one more char than needed, because it did not distinguish exclusive and inclusive end position. For avoidance of doubt, stop detoasting extra. Back-patch to v14, like the above commit. For applications using SUBSTRING() on non-ASCII column values, consider applying this to your copy of any of the February 12, 2026 releases. Reported-by: SATŌ Kentarō <ranvis@gmail.com> Reviewed-by: Thomas Munro <thomas.munro@gmail.com> Bug: #19406 Discussion: https://postgr.es/m/19406-9867fddddd724fca@postgresql.org Backpatch-through: 14
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.
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