Mihailo Aleksic created SPARK-52461:
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Summary: Collapse inner cast from DecimalType to DecimalType
Key: SPARK-52461
URL: https://issues.apache.org/jira/browse/SPARK-52461
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.1.0
Reporter: Mihailo Aleksic
When coercing an expression from DecimalType to DecimalType, remove the inner
Cast if it is not user-specified one and if the outer DecimalType is wider than
inner (precision and scale are greater) - or in other words, if it is
redundant. Do that only in case SQLConf.COLLAPSE_INNER_CAST_TO_DECIMAL value is
true.
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