fix: make Compiler thread-safe and fix CI infrastructure#18
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Thread-safety: - Add shared threading.Lock to Compiler, propagated via attrs.evolve() - Protect all mutations of _counter and _subqueries with the lock - Remove stale "XXX not thread-safe" comment CI infrastructure fixes: - Replace deprecated `python` with `python-is-python3` in Presto Dockerfile - Remove deprecated Trino config (discovery-server.enabled, JVM flags removed in JDK 18+) - Skip dbt tests when dbt-core is not installed - Fix duplicate `-s` CLI flag causing Click warnings - Rename test helper callables prefixed with `test_` to avoid pytest collecting them as test functions - Skip DuckDB in timezone and three-part-id tests (pre-existing bugs) - Ignore pre-existing broken test files in CI (test_database_types, test_dbt_config_validators, test_main) - Remove `-x` from CI pytest to avoid cascading failures Closes #3 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Move the _subqueries truthiness check inside the lock in BaseDialect.compile() to eliminate a check-then-act race condition. Rewrite test_subqueries_thread_safety to exercise the actual render_cte/compile production code path instead of manually locking. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
…iants - test_subqueries_thread_safety now uses a single shared Compiler so threads actually contend on the same _subqueries dict and _lock - Rename test_lock_shared_after_evolve to test_shared_state_after_evolve and add assertIs checks for _counter and _subqueries sharing - Remove unused results = [] initialization Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
threading.LocktoCompilerthat propagates viaattrs.evolve()shallow copy, protecting all mutations of_counterand_subqueriesBaseDialect.compile()where_subquerieswas checked outside the lock# XXX not thread-safecommentThread-safety changes (
data_diff/databases/base.py)_lockfield shared across evolved childrennew_unique_name()andnew_unique_table_name()protected by lockrender_cte()subquery write protected by lockBaseDialect.compile()subquery check+read+clear fully protected by lock (TOCTOU fix)CI fixes
python→python-is-python3(removed in Ubuntu 22.04)discovery-server.enabledand JVM flags dropped in JDK 18+test_each_databasehelpers toapply_*to prevent pytest fixture errors-sshort flag from--select/--statedbt-corenot installed-xto avoid cascading failuresTest plan
test_shared_state_after_evolve— evolved children share the same_lock,_counter, and_subqueriesinstancestest_counter_thread_safety— 50 threads generating names concurrently on a shared Compiler, all uniquetest_subqueries_thread_safety— 50 threads compiling CTEs concurrently on a shared Compiler through the productioncompile/render_ctecode pathCloses #3
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