This bug occurred when arguments were read for the GROUP BY sorter — all
arguments were incorrectly resolved to the first column. Added tests
confirm that aggregates now work correctly both with and without the
sorter.
When adding tests for extensions, please follow these guidelines:
Tests that verify the internal logic or behavior of a particular extension should go into cli_tests/extensions.py.
Tests that verify how extensions interact with the database engine, such as virtual table handling, should be written
in TCL (see vtab.test as an example).
To check which extensions are available in TCL, or to add a new one, refer to the tester.tcl file and look at the extension_map.