Add current_schema() and current_schemas() inquiry functions.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: a309032d2fbb02ce43c42b5d4da2dc8328f4bc9e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2002-04-26T01:24:08Z
Releases: 7.3.1
Add current_schema() and current_schemas() inquiry functions.
Update has_table_privilege functions to cope with schema-qualified
names in the same way as nextval() and others.

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