Takuya Ueshin created SPARK-25208:
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Summary: Loosen Cast.forceNullable for DecimalType.
Key: SPARK-25208
URL: https://issues.apache.org/jira/browse/SPARK-25208
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Takuya Ueshin
Casting to {{DecimalType}} is not always needed to force nullable.
If the decimal type to cast is wider than original type, or only truncating or
precision loss, the casted value won't be {{null}}.
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