[v1.5] Remove insert-vs-alter transaction conflict check#15
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Concurrent INSERT and ALTER TABLE operations (e.g., ADD COLUMN, RENAME COLUMN) on the same table should not conflict. Each data file carries its own mapping_id that describes the column layout at write time. The multi-file reader uses this mapping to correctly read files written under older schemas, so an INSERT that was planned before an ALTER can safely commit after it. This is needed for tools like sqlmesh that perform schema evolution (ALTER TABLE) on target tables while concurrent data pipelines INSERT into those same tables. Previously, the INSERT would fail with "Transaction conflict - attempting to insert into table - but another transaction has altered it" after exhausting all retries. The insert-vs-drop conflict check is preserved since a dropped table is genuinely gone. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]>
…ing in concurrency test
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Cherry-picked from #2 to v1.5-variegata