pgsql: Fix yet another bug in ON CONFLICT rule deparsing.

Fix yet another bug in ON CONFLICT rule deparsing.

Expand testing of rule deparsing a good bit, it's evidently needed.

Author: Peter Geoghegan, Andres Freund
Discussion: CAM3SWZQmXxZhQC32QVEOTYfNXJBJ_Q2SDENL7BV14Cq-zL0FLg@mail.gmail.com

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/284bef297733e553c73f1c858e0ce1532f754d18

Modified Files
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src/backend/utils/adt/ruleutils.c | 2 +-
src/test/regress/expected/rules.out | 55 +++++++++++++++++++++++++++++++++--
src/test/regress/sql/rules.sql | 23 +++++++++++++--
3 files changed, 75 insertions(+), 5 deletions(-)

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