aokolnychyi opened a new pull request #23632: [SPARK-26706][SQL] Fix Cast$mayTruncate for bytes URL: https://github.com/apache/spark/pull/23632 ## What changes were proposed in this pull request? This PR contains a minor change in `Cast$mayTruncate` that fixes its logic 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]` behave differently. Potentially, this bug can silently corrupt someone's data. ``` // executes silently even though Long is converted into Byte spark.range(Long.MaxValue - 10, Long.MaxValue).as[Byte] .map(b => b - 1) .show() +-----+ |value| +-----+ | -12| | -11| | -10| | -9| | -8| | -7| | -6| | -5| | -4| | -3| +-----+ // throws an AnalysisException: Cannot up cast `id` from bigint to smallint as it may truncate spark.range(Long.MaxValue - 10, Long.MaxValue).as[Short] .map(s => s - 1) .show() ``` ## How was this patch tested? This PR comes with a set of unit tests.
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