[pgpool-committers: 8718] pgpool: Fix to not cache SELECT having functions with return types are

[Tatsuo Ishii]

Fix to not cache SELECT having functions with return types are timestamptz or timetz.

Functions with return type is timestamptz or timetz is affected by time zone setting.
Consider following scenario:

1) SELECT having such functions gets called and cache created.

2) time zone is changed.

3) same SELECT is called and the cache is used. The cache value is
correct any more because of the time zone change.

Discussion: https://www.pgpool.net/pipermail/pgpool-general/2022-July/008367.html

Branch
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V4_3_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=724cf6e773eb81a3ccfda4dd30d6ea73a6f3ea74

Modified Files
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src/test/regression/tests/006.memqcache/test.sh |   3 +
src/utils/pool_select_walker.c                  | 113 ++++++++++++++++++++++--
2 files changed, 108 insertions(+), 8 deletions(-)