Devin Petersohn created SPARK-55980:
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Summary: Always apply _cast_back_float in numeric arithmetic
Key: SPARK-55980
URL: https://issues.apache.org/jira/browse/SPARK-55980
Project: Spark
Issue Type: Bug
Components: Pandas API on Spark
Affects Versions: 4.1.1
Reporter: Devin Petersohn
`_cast_back_float()` preserves float32 dtype in arithmetic results, matching
pandas behavior. Under ANSI mode, Spark widens float32 to float64 during
arithmetic with non-float32 numeric operands, and this helper casts it back.
Currently the helper is only called when ANSI mode is enabled, but it should
always be called so behavior is the same with or without ANSI mode enabled.
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