Validate dense union offset lengths#875
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What changed
NewDenseUnionFromArraysWithFieldCodes now rejects mismatched type ID and offset lengths before constructing dense union data.
Why
Dense unions use typeIDs.Len() as the logical length while borrowing the offsets buffer. If the offsets array is shorter, later access can panic or read invalid offset data; if it is longer, trailing offsets are silently ignored.
Validation