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docs: add multiple conditional clauses examples to merge docs - #4890
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ion-elgreco
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Oct 20, 2026
The merge docs showed per-clause predicates only for delete and did not show how several clauses of the same kind combine. Add a section demonstrating two when_matched_update clauses with different predicates (first match wins) and a conditional when_not_matched_insert. Both examples were verified against deltalake 1.6.6. Closes delta-io#3345 Signed-off-by: Shahzeb Ali <[email protected]>
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Description
The merge docs showed per-clause predicates only for delete, and did not show how several clauses of the same kind combine. This adds a "Multiple conditional clauses" section to
docs/usage/merging-tables.mddemonstrating:when_matched_updateclauses with different per-clause predicates (first match wins): flag orders with a >50% amount jump for manual review, apply the new amount directly otherwise.when_not_matched_insert: only insert source rows satisfying an extra predicate.Both examples were verified against deltalake 1.6.6 with the exact outputs shown in the docs.
Related Issue
Closes #3345