Web Reference: Feb 26, 2026 · IMMUTABLE indicates that the function cannot modify the database and always returns the same result when given the same argument values; that is, it does not do database lookups or otherwise use information not directly present in its argument list. Nov 18, 2011 · I'm trying to define a function along the lines of: SELECT a.col1, b.col2 FROM a, b WHERE col1 = ANY($1); However postgres doesn't seem happy with "record" as the return type, giving me this error when I try to execute the function: Looking through the docs though I can't work out how to supply this column definition list. Apr 1, 2023 · It's a VOLATILE function, so it doesn't seem likely that it's a "cached" value. Any suggestions? app_id is both a parameter of the function and a column name in the query inside the function (app_versions.app_id), and the column name takes priority. This is a common gotcha.
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