fix: column writer for dictionary decimal primitive type #6987
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Which issue does this PR close?
Closes #.
Rationale for this change
Currently Parquet reads/writes for Arrow
Dictionary(Decimal)type where Decimal is INT-based is falling back toarrow_cast::cast, which leads to losing precision.What changes are included in this PR?
For
Dictionary(Decimal)type where decimal is int-based, writer and reader now performarrow_cast::castonly for dictionary packing/unpacking, while values are only casted to required integer type without being modified, similar to how regularDecimalworks.Are there any user-facing changes?
No