[pgpool-committers: 8711] pgpool: Fix query cache to not cache timestamptz and timetz cast.

[Tatsuo Ishii]

Fix query cache to not cache timestamptz and timetz cast.

Even if query is constant + cast (like '2022-07-05
14:07:00'::timestamptz), the result can be changed by SET TIME ZONE
command etc. and the result should not be cached.
Also regression test data added.

Discussion: https://www.pgpool.net/pipermail/pgpool-general/2022-July/008353.html

Branch
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V3_7_STABLE

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=2a6a721888454550ad9071b501cc77d4df3474cf

Modified Files
--------------
src/rewrite/pool_timestamp.c                    |  4 +++-
src/test/regression/tests/006.memqcache/test.sh | 16 ++++++++++++++++
src/utils/pool_select_walker.c                  | 17 ++++++-----------
3 files changed, 25 insertions(+), 12 deletions(-)