pgsql: Clean up some loose ends from the column privileges patch: add

Log Message:
-----------
Clean up some loose ends from the column privileges patch: add
has_column_privilege and has_any_column_privilege SQL functions; fix the
information_schema views that are supposed to pay attention to column
privileges; adjust pg_stats to show stats for any column you have select
privilege on; and fix COPY to allow copying a subset of columns if the user
has suitable per-column privileges for all the columns.

To improve efficiency of some of the information_schema views, extend the
has_xxx_privilege functions to allow inquiring about the OR of a set of
privileges in just one call.  This is just exposing capability that already
existed in the underlying aclcheck routines.

In passing, make the information_schema views report the owner's own
privileges as being grantable, since Postgres assumes this even when the grant
option bit is not set in the ACL.  This is a longstanding oversight.

Also, make the new has_xxx_privilege functions for foreign data objects follow
the same coding conventions used by the older ones.

Stephen Frost and Tom Lane

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.470 -> r1.471)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml?r1=1.470&r2=1.471)
        information_schema.sgml (r1.37 -> r1.38)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/information_schema.sgml?r1=1.37&r2=1.38)
    pgsql/src/backend/catalog:
        aclchk.c (r1.152 -> r1.153)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/aclchk.c?r1=1.152&r2=1.153)
        information_schema.sql (r1.50 -> r1.51)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/information_schema.sql?r1=1.50&r2=1.51)
        system_views.sql (r1.58 -> r1.59)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/catalog/system_views.sql?r1=1.58&r2=1.59)
    pgsql/src/backend/commands:
        copy.c (r1.304 -> r1.305)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/commands/copy.c?r1=1.304&r2=1.305)
    pgsql/src/backend/utils/adt:
        acl.c (r1.146 -> r1.147)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/acl.c?r1=1.146&r2=1.147)
    pgsql/src/include/catalog:
        catversion.h (r1.520 -> r1.521)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/catversion.h?r1=1.520&r2=1.521)
        pg_proc.h (r1.535 -> r1.536)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_proc.h?r1=1.535&r2=1.536)
    pgsql/src/include/utils:
        builtins.h (r1.330 -> r1.331)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/utils/builtins.h?r1=1.330&r2=1.331)
    pgsql/src/test/regress/expected:
        foreign_data.out (r1.5 -> r1.6)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/foreign_data.out?r1=1.5&r2=1.6)
        privileges.out (r1.44 -> r1.45)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/privileges.out?r1=1.44&r2=1.45)
        rules.out (r1.148 -> r1.149)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/expected/rules.out?r1=1.148&r2=1.149)
    pgsql/src/test/regress/sql:
        privileges.sql (r1.23 -> r1.24)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/test/regress/sql/privileges.sql?r1=1.23&r2=1.24)