Stabilize recently-added information_schema test queries.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 3157cbe974846729d49a1ee081944eee1839bdd8
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2021-04-15T20:31:44Z
Releases: 14.0
Stabilize recently-added information_schema test queries.

These queries could show unexpected entries if the core system,
or concurrently-running test scripts, created any functions that
would appear in the information_schema views.  Restrict them
to showing functions belonging to this test's schema, as the
far-older nearby test case does.

Per experimentation with conversion of some built-in functions
to SQL-function-body style.

Files