pgsql: Implement information_schema.parameters.parameter_default column

Implement information_schema.parameters.parameter_default column

Reviewed-by: Ali Dar <ali(dot)munir(dot)dar(at)gmail(dot)com>
Reviewed-by: Amit Khandekar <amit(dot)khandekar(at)enterprisedb(dot)com>
Reviewed-by: Rodolfo Campero <rodolfo(dot)campero(at)anachronics(dot)com>

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/85ed91ee7da8f560c3443733cbda2862cd25facd

Modified Files
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doc/src/sgml/information_schema.sgml | 9 +++
src/backend/catalog/information_schema.sql | 9 ++-
src/backend/utils/adt/ruleutils.c | 84 +++++++++++++++++++++++
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 2 +
src/include/utils/builtins.h | 1 +
src/test/regress/expected/create_function_3.out | 33 ++++++++-
src/test/regress/sql/create_function_3.sql | 24 +++++++
8 files changed, 160 insertions(+), 4 deletions(-)