Re: proposal: schema variables

hi.

GRANT|REVOKE  ALL VARIABLES IN SCHEMA schema_name [, ...] }
seems to work.
might be better to add tests.

also src/bin/psql/tab-complete.in.c
COMPLETE_WITH_SCHEMA_QUERY_PLUS(Query_for_list_of_grantables,
we can also add "ALL VARIABLES IN SCHEMA "

also need change this <para> in grant.sgml:
  <para>
   There is also an option to grant privileges on all objects of the same
   type within one or more schemas.  This functionality is currently supported
   only for tables, sequences, functions, and procedures.  <literal>ALL
   TABLES</literal> also affects views and foreign tables, just like the
   specific-object <command>GRANT</command> command.  <literal>ALL
   FUNCTIONS</literal> also affects aggregate and window functions, but not
   procedures, again just like the specific-object <command>GRANT</command>
   command.  Use <literal>ALL ROUTINES</literal> to include procedures.
  </para>

revoke.sgml, we should use <replaceable
class="parameter">role_specification</replaceable>?
so it will become like:

REVOKE [ GRANT OPTION FOR ]
    { { SELECT | UPDATE } [, ...] | ALL [ PRIVILEGES ] }
    ON { VARIABLE variable_name [, ...]
       | ALL VARIABLES IN SCHEMA schema_name [, ...] }
    FROM role_specification [, ...]

maybe also add
[ GRANTED BY role_specification ]
but I didn't test "REVOKE [ GRANTED BY role_specification ]".

Speaking of acl tests,
similar to has_table_privilege I am afraid we need to have a function
like has_variable_privilege for acl tests.
has_table_privilege has 6 function signatures. so there will be more code.
------------------------------------------------------
doc/src/sgml/ref/create_variable.sgml
<synopsis> section:
CREATE VARIABLE [ IF NOT EXISTS ] name [ AS ] data_type ] [ COLLATE collation ]

redundant right square bracket after "data_type".