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Python's `execute_merge_insert` now takes a `PyScannable` (like `add()`), and the source collection threshold is exposed as a `source_collect_threshold_bytes` kwarg on `execute()` and a `merge_insert_source_collect_threshold_bytes` connection option. Node passes the decoded IPC batches as a `Vec<RecordBatch>`, so the merge join sees their exact row count. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>