[reitblatt]

Summary

The demo query the docs and demo.sh suggest, ContainsHello == True, matched nothing. Boolean features couldn't be filtered at all.

Root cause: Druid's schema discovery (useSchemaDiscovery: true in druid/specs/execution_results.json) ingests JSON booleans as BIGINT 1/0. DruidQueryTransformer sent Feature == True as {"type": "selector", "value": true}, which never matches a long column. The query language's type checker rejects ContainsHello == 1 (bool vs int), so users had no working form. ContainsHello != True matched every event.

Fix: boolean comparisons (==, !=, in, not in, and not of these) now translate to an in filter on ["1", "true"] / ["0", "false"]. That matches the long columns schema discovery produces and also string-typed dimensions. Non-boolean comparisons are unchanged.

The query is now correct as written, so the docs (docs/concepts.md, docs/development/README.md, docs/rules/examples.md) and demo.sh need no changes.

Testing

• New parametrized test test_boolean_comparisons_match_how_druid_stores_booleans covers ==, !=, reversed operands, not, in, and not in.
• ./run-tests.sh (full suite) passes; pre-commit passes.
• Local stack with --profile test_data, via POST /events/timeseries on the UI API:

Query	Before	After
ContainsHello == True	0	27
ContainsHello == False	0	66
ContainsHello != True	all events	66
ContainsHello in [True]	—	27
EventType == "create_post" (all events)	—	93

The /events/scan results for ContainsHello == True are the posts that contain "hello".

🤖 Generated with Claude Code

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