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The list of transform objects that a function should use is specified in CREATE FUNCTION's TRANSFORM clause, and then represented indirectly in pg_proc.protrftypes. However, ProcedureCreate completely ignored that for purposes of constructing pg_depend entries, and instead made the function depend on any transforms that exist for its parameter or return data types. This is bad in both directions: the function could be made dependent on a transform it does not actually use, or it could try to use a transform that's since been dropped. (The latter scenario would require use of a transform that's not for any of the parameter or return types, but that seems legit for cases where the function performs SQL operations internally.) To fix, pass in the list of transform objects that CreateFunction identified, and build pg_depend entries from that not from the parameter/return types. This results in changes in the expected test outputs in contrib/bool_plperl, which I guess are due to different ordering of pg_depend entries -- that test case is surely not exercising either of the problem scenarios. This fix is not back-patchable as-is: changing the signature of ProcedureCreate seems too risky in stable branches. We could do something like making ProcedureCreate a wrapper around ProcedureCreateExt or so. However, I'm more inclined to do nothing in the back branches. We had no field complaints up to now, so the hazards don't seem to be a big issue in practice. And we couldn't do anything about existing pg_depend entries, so a back-patched fix would result in a mishmash of dependencies created according to different rules. That cure could be worse than the disease, perhaps. I bumped catversion just to lay down a marker that the expected contents of pg_depend are a bit different than before. Reported-by: Chapman Flack <jcflack@acm.org> Author: Tom Lane <tgl@sss.pgh.pa.us> Discussion: https://postgr.es/m/3112950.1743984111@sss.pgh.pa.us
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.
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