[python][ray] Support multi-clause fall-through in merge_into#8115

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XiaoHongbo-Hope wants to merge 12 commits into

apache:masterfrom

XiaoHongbo-Hope:support_multi_clause

Commits on Jun 4, 2026

[ray] Support multi-clause fall-through in merge_into
XiaoHongbo-Hope
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[ray] Fix NULL row loss, strengthen first-wins test, hoist imports
XiaoHongbo-Hope
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[ray] Fail fast on duplicate source rows in multi-clause matched path
XiaoHongbo-Hope
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[ray] Remove redundant row_id_col assignment in loop
XiaoHongbo-Hope
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[ray] Move duplicate check to per-clause matched rows
XiaoHongbo-Hope
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[ray] Add batch-level duplicate check for multi-clause matched path
XiaoHongbo-Hope
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[ray] Drop mode='all' from count_distinct for consistency
XiaoHongbo-Hope
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[ray] Remove batch-level duplicate check, keep per-clause only
XiaoHongbo-Hope
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[ray] Use condition complement for matched remaining, not _ROW_ID
XiaoHongbo-Hope
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[ray] Hoist on_map construction outside preparation loop
XiaoHongbo-Hope
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[ray] Add matched-path NULL fall-through test for multi-clause
XiaoHongbo-Hope
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[ray] Reject unconditional non-last clause in merge_into
XiaoHongbo-Hope
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