[VL][DELTA] Reconcile struct field names in CaseWhen/If for Velox SWITCH compatibility#11948
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acvictor wants to merge 1 commit intoapache:mainfrom
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[VL][DELTA] Reconcile struct field names in CaseWhen/If for Velox SWITCH compatibility#11948acvictor wants to merge 1 commit intoapache:mainfrom
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What changes are proposed in this pull request?
Delta column mapping remaps struct field names to physical UUIDs (col-), but MERGE plan CaseWhen branches can mix physical and logical field names. Velox SWITCH requires exact type matching including field names, causing InvariantViolationException on MERGE with column-mapped struct columns:
This PR adds StructTypeReconciler that detects struct field name mismatches across conditional expression branches and wraps mismatched branches in ROW casts to normalize field names. Handles nested structs, arrays of structs, and maps.
How was this patch tested?
Added UT
Was this patch authored or co-authored using generative AI tooling?
No