pgsql: Fire per-statement triggers on partitioned tables.

Fire per-statement triggers on partitioned tables.

Even though no actual tuples are ever inserted into a partitioned
table (the actual tuples are in the partitions, not the partitioned
table itself), we still need to have a ResultRelInfo for the
partitioned table, or per-statement triggers won't get fired.

Amit Langote, per a report from Rajkumar Raghuwanshi. Reviewed by me.

Discussion: http://postgr.es/m/CAKcux6%3DwYospCRY2J4XEFuVy0L41S%3Dfic7rmkbsU-GXhhSbmBg%40mail.gmail.com

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/e180c8aa8caf5c55a273d4a8e6092e77ff3cff10

Modified Files
--------------
doc/src/sgml/trigger.sgml | 19 ++++----
src/backend/executor/execMain.c | 55 ++++++++++++++++++++--
src/backend/executor/nodeModifyTable.c | 42 +++++++++++++----
src/backend/nodes/copyfuncs.c | 2 +
src/backend/nodes/outfuncs.c | 3 ++
src/backend/nodes/readfuncs.c | 2 +
src/backend/optimizer/plan/createplan.c | 1 +
src/backend/optimizer/plan/planner.c | 3 ++
src/backend/optimizer/plan/setrefs.c | 19 ++++++--
src/include/nodes/execnodes.h | 12 +++++
src/include/nodes/plannodes.h | 13 +++++-
src/include/nodes/relation.h | 1 +
src/test/regress/expected/triggers.out | 81 +++++++++++++++++++++++++++++++++
src/test/regress/sql/triggers.sql | 70 ++++++++++++++++++++++++++++
14 files changed, 296 insertions(+), 27 deletions(-)