pgsql: Show default privileges in information schema

Show default privileges in information schema

Hitherto, the information schema only showed explicitly granted
privileges that were visible in the *acl catalog columns. If no
privileges had been granted, the implicit privileges were not shown.

To fix that, add an SQL-accessible version of the acldefault()
function, and use that inside the aclexplode() calls to substitute the
catalog-specific default privilege set for null values.

reviewed by Abhijit Menon-Sen

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/b376ec6fa57bc76037014ede29498e2d1611968e

Modified Files
--------------
src/backend/catalog/information_schema.sql | 18 ++++----
src/backend/utils/adt/acl.c | 58 ++++++++++++++++++++++++++++
src/include/catalog/catversion.h | 2 +-
src/include/catalog/pg_proc.h | 2 +
src/include/utils/acl.h | 1 +
src/test/regress/expected/foreign_data.out | 8 ++--
src/test/regress/sql/foreign_data.sql | 8 ++--
7 files changed, 79 insertions(+), 18 deletions(-)