Add analysis of explain_todo test inconsistencies #74
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Investigation found that the 2446 explain_todo tests contain fundamental data inconsistencies that prevent systematic fixes: - LIMIT 0/FORMAT stripping varies between similar tests - SETTINGS position expectations differ for same syntax - AND/OR flattening expectations are inconsistent The root cause is that explain.txt files were generated from different ClickHouse versions. Fixes that work for explain_todo tests break existing passing tests. Detailed analysis in EXPLAIN_TODO_ANALYSIS.md
- Update ClickHouse version to 25.12.1.649 (stable) - Use ClickHouse server instead of spawning clickhouse local for each query - Process statements in parallel with configurable worker count - Add version comment stripping in parser_test.go for compare - Remove old bash generate_explain.sh script
This test ensures all explain.txt files have the same ClickHouse version header comment, which guarantees test expectations were generated from a consistent ClickHouse version. The test will fail until explain.txt files are regenerated with version headers using: go run ./cmd/regenerate-explain
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Investigation found that the 2446 explain_todo tests contain
fundamental data inconsistencies that prevent systematic fixes:
The root cause is that explain.txt files were generated from
different ClickHouse versions. Fixes that work for explain_todo
tests break existing passing tests.
Detailed analysis in EXPLAIN_TODO_ANALYSIS.md