pgsql: Add btree and hash opclasses for pg_lsn.

Add btree and hash opclasses for pg_lsn.

This is needed to allow ORDER BY, DISTINCT, etc to work as expected for
pg_lsn values.

We had previously decided to put this off for 9.5, but in view of commit
eeca4cd35e284c72b2ea1b4494e64e7738896e81 there's no reason to avoid a
catversion bump for 9.4beta2, and this does make a pretty significant
usability difference for pg_lsn.

Michael Paquier, with fixes from Andres Freund and Tom Lane

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/4c8ab1b91d2bd154031f7bc8529b9e6e2f1cc443

Modified Files
--------------
src/backend/utils/adt/pg_lsn.c | 28 +++++++-
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_amop.h | 12 ++++
src/include/catalog/pg_amproc.h | 2 +
src/include/catalog/pg_opclass.h | 2 +
src/include/catalog/pg_operator.h | 2 +-
src/include/catalog/pg_opfamily.h | 2 +
src/include/catalog/pg_proc.h | 4 ++
src/include/utils/pg_lsn.h | 2 +
src/test/regress/expected/pg_lsn.out | 130 ++++++++++++++++++++++++++++++++++
src/test/regress/sql/pg_lsn.sql | 14 ++++
11 files changed, 196 insertions(+), 4 deletions(-)