Anton Okolnychyi created SPARK-26706:
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Summary: Fix Cast$mayTruncate for bytes
Key: SPARK-26706
URL: https://issues.apache.org/jira/browse/SPARK-26706
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.3.3, 3.0.0
Reporter: Anton Okolnychyi
The logic in {{Cast$mayTruncate}} is broken for bytes.
Right now, {{mayTruncate(ByteType, LongType)}} returns {{false}} while
{{mayTruncate(ShortType, LongType)}} returns {{true}}. Consequently,
{{spark.range(1, 3).as[Byte]}} and {{spark.range(1, 3).as[Short]}} will behave
differently.
Potentially, this bug can silently corrupt someone's data.
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