Обсуждение: pgsql: Refactor AlterExtensionContentsStmt grammar

Refactor AlterExtensionContentsStmt grammar

Make use of the general object support already used by COMMENT, DROP,
and SECURITY LABEL.

Discussion: https://www.postgresql.org/message-id/flat/163c00a5-f634-ca52-fc7c-0e53deda8735%402ndquadrant.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/8f5b5967441f05e56446fa4cdeffd0774c01e553

Modified Files
--------------
src/backend/commands/extension.c                   |  19 +++
src/backend/parser/gram.y                          | 157 ++-------------------
.../modules/test_pg_dump/expected/test_pg_dump.out |   4 +-
3 files changed, 31 insertions(+), 149 deletions(-)