pgsql: Issue a warning during the creation of hash indexes

Issue a warning during the creation of hash indexes

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/84aa8ba128a08e6fdebb2497c7a79ebf18093e12

Modified Files
--------------
src/backend/commands/indexcmds.c               |    4 ++++
src/test/regress/expected/create_index.out     |    4 ++++
src/test/regress/expected/enum.out             |    1 +
src/test/regress/expected/macaddr.out          |    1 +
src/test/regress/expected/replica_identity.out |    1 +
src/test/regress/expected/uuid.out             |    1 +
6 files changed, 12 insertions(+)