An unrecognized operator dict on a non-JSONB column (e.g.
{"session_id": {"operator": "null"}}) fell through to `column == value`,
binding a dict to a VARCHAR parameter. That compiles, then fails in the
driver at execute time with "cannot adapt type 'dict'" — an unhandled
500 for what is invalid input.
Raise FilterError (422) instead. The guard lives in the shared
_build_field_condition, so every route through apply_filter is covered.
It keys on the actual column type rather than the JSONB_COLUMNS name
list, so dict equality still works on JSONB columns reachable through
Document's raw-key fallback (e.g. source_ids), where the driver adapts
dicts fine.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
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