fix: Add legacy mode handling to cast Decimal to String#3939
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parthchandra wants to merge 7 commits intoapache:mainfrom
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fix: Add legacy mode handling to cast Decimal to String#3939parthchandra wants to merge 7 commits intoapache:mainfrom
parthchandra wants to merge 7 commits intoapache:mainfrom
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@andygrove @kazuyukitanimura this is ready for review |
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Which issue does this PR close?
Part of #286
Fixes: #1068
Rationale for this change
CometCast.canCastToStringhad previously marked DecimalType -> StringType as Compatible with a caveat. However, the native Decimal128 -> String cast was not explicitly handled in cast_array and it was falling through to DataFusion's built-in cast, which was incompatible with Spark legacy mode for large scale values.For example, zero with a large scale: Decimal(38,18) zero exponent = -18 which produced "0E-18" in Spark LEGACY but "0.000000000000000000" from Comet
TRY and ANSI modes are compatible
What changes are included in this PR?
Adds explicit handling for legacy mode
How are these changes tested?
unit tests