It is possible that an expression ends up with a collatable type but
without a collation. CREATE TABLE AS could then create a table based
on that. But such a column cannot be dumped with valid SQL syntax, so
we disallow creating such a column.
per test report from Noah Misch
- collowner field
- CREATE COLLATION
- ALTER COLLATION
- DROP COLLATION
- COMMENT ON COLLATION
- integration with extensions
- pg_dump support for the above
- dependency management
- psql tab completion
- psql \dO command
This adds collation support for columns and domains, a COLLATE clause
to override it per expression, and B-tree index support.
Peter Eisentraut
reviewed by Pavel Stehule, Itagaki Takahiro, Robert Haas, Noah Misch
