[python][ray] Optimize merge into self-merge updates on data evolution table#8141
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[python][ray] Optimize merge into self-merge updates on data evolution table#8141XiaoHongbo-Hope wants to merge 2 commits into
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When source == target with ON ['_ROW_ID'], skip the inner join and read the table only once. Aligned with Spark's isSelfMergeOnRowId detection logic.
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…artifacts - Remove incorrect len(clauses) guards reintroduced during rebase in build_matched_update_ds and build_not_matched_insert_ds - Align build_self_merge_update_ds with multi-clause fall-through pattern used by build_matched_update_ds
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Tests