0f43083d16
This is yet another bit of fallout from the fact that backend/parser (like other code) feels free to scribble on the parse tree it's handed. In this case that resulted in modifying the relatively-short-lived copy in the cached function's source_list. That would be fine since we only need each source_list tree once ... except that if the parser fails after making some changes, the function cache entry remains as-is and will still be there if the user tries to execute the function again. Then we have problems because we're feeding a non-pristine tree to the parser. The most expedient fix is a quick copyObject(). I considered other answers like somehow marking the cache entry invalid temporarily, but that would add complexity and I'm not sure it's worth it. In typical scenarios we'd only do this once per function query per session. Reported-by: Alexander Lakhin <exclusion@gmail.com> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/6d442183-102c-498a-81d1-eeeb086cdc5a@gmail.com
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.
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/.