Tests `util` and `repair` both used the same user name, so when
executing in the same parallel suite they could cause conflict.
Instead, use different role names for different tests.
To increase schema security we do not want to mix our own internal
objects with user objects. Since chunks are created in the
_timescaledb_internal schema our internal functions should live in
a different dedicated schema. This patch make the necessary
adjustments for the following functions:
- get_partition_for_key(val anyelement)
- get_partition_hash(val anyelement)
All partitioning functions now has the signature `int func(anyelement)`.
This cleans up some special handling that was necessary to support
the legacy partitioning function that expected text input.
This commit moves a lot of test setup logic to runner.sh. Also
passes the right commands to the regression infrastructure to create
appropriate users and run tests as a regular user.
Clean up the table schema to get rid of legacy tables and functionality
that makes it more difficult to provide an upgrade path.
Notable changes:
* Get rid of legacy tables and code
* Simplify directory structure for SQL code
* Simplify table hierarchy: remove root table and make chunk tables
* inherit directly from main table
* Change chunk table suffix from _data to _chunk
* Simplify schema usage: _timescaledb_internal for internal functions.
* _timescaledb_catalog for metadata tables.
* Remove postgres_fdw dependency
* Improve code comments in sql code
