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Why can I reliably create/drop temporary tables in PL/PgSQL functions?

April 26, 2017create drop functions pgsql PL reliably tables Temporary

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Why can I reliably create/drop temporary tables in PL/PgSQL functions?

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PL/PgSQL caches function contents, and an unfortunate side effect is that if a PL/PgSQL function accesses a temporary table, and that table is later dropped and recreated, and the function called again, the function will fail because the cached function contents still point to the old temporary table. The solution is to use EXECUTE for temporary table access in PL/PgSQL. This will cause the query to be reparsed every time.