pgsql: Various fixes around ON CONFLICT for rule deparsing.

Various fixes around ON CONFLICT for rule deparsing.

Neither the deparsing of the new alias for INSERT's target table, nor of
the inference clause was supported. Also fixup a typo in an error
message.

Add regression tests to test those code paths.

Author: Peter Geoghegan

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/9bc77c45199c7d2e525cd5b1457d5a57f6e9edb0

Modified Files
--------------
src/backend/parser/parse_clause.c | 2 +-
src/backend/utils/adt/ruleutils.c | 79 ++++++++++++++++++++++++-
src/test/regress/expected/insert_conflict.out | 2 +-
src/test/regress/expected/rules.out | 66 +++++++++++++++------
src/test/regress/sql/rules.sql | 14 ++++-
5 files changed, 140 insertions(+), 23 deletions(-)

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