[COMMITTERS] pgsql: Fix multi-column range partitioning constraints.

Fix multi-column range partitioning constraints.

The old logic was just plain wrong.

Report by Olaf Gawenda.  Patch by Amit Langote, reviewed by
Beena Emerson and by me.  Minor adjustments by me also.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/f8bffe9e6d700fd34759a92e47930ce9ba7dcbd5

Modified Files
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src/backend/catalog/partition.c       | 663 ++++++++++++++++++++++------------
src/include/nodes/pg_list.h           |  14 +
src/test/regress/expected/inherit.out |  90 +++++
src/test/regress/expected/insert.out  |  59 +++
src/test/regress/sql/inherit.sql      |  18 +
src/test/regress/sql/insert.sql       |  43 +++
6 files changed, 666 insertions(+), 221 deletions(-)