pgsql: Restore test case from a2b70c89ca1a5fcf6181d3c777d82e7b83d2de1b.

Restore test case from a2b70c89ca1a5fcf6181d3c777d82e7b83d2de1b.

Revert the reversion commits a20aac890 and 9b644745c. In the wake of
commit 7df2c1f8d, we should get stable buildfarm results from this test;
if not, I'd like to know sooner not later.

Discussion: /messages/by-id/CAA4eK1JkByysFJNh9M349u_nNjqETuEnY_y1VUc_kJiU0bxtaQ@mail.gmail.com

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/5816ddc707e03342502975456d864448ab8dc333

Modified Files
--------------
src/test/regress/expected/select_parallel.out | 43 +++++++++++++++++++++++++++
src/test/regress/sql/select_parallel.sql | 16 ++++++++++
2 files changed, 59 insertions(+)

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