API, Core, Spark: Add CONTAINS and NOT_CONTAINS expressions - #17906
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API, Core, Spark: Add CONTAINS and NOT_CONTAINS expressions#17906shiva-imc wants to merge 1 commit into
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Spark emits a DSv2 CONTAINS predicate for contains() but Iceberg has no matching operation, so predicates decidable from partition values fall back to row-level scans. Evaluation is exact where complete values exist and conservative from truncated bounds, mirroring STARTS_WITH.
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Add
CONTAINS/NOT_CONTAINS(substring match on string terms) to the expression API, alongside the existingSTARTS_WITH/NOT_STARTS_WITH.Spark emits a DSv2
CONTAINSpredicate for thecontains()function, but Iceberg has no matching operation, so the predicate is dropped atSparkV2Filtersand any operation that could otherwise be answered from metadata falls back to row-level scans. The motivating case:DELETE FROM t WHERE contains(part_col, 'x')on an identity-partitioned column is decidable exactly from partition values, but today plans as a full copy-on-write scan-and-rewrite. With this change it plans as a metadata-only delete.