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https://issues.apache.org/jira/browse/SPARK-46251?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Will Boulter updated SPARK-46251:
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Summary: Spark 3.3.3 tuple encoders do not correctly cast null into None
for Option values (was: Spark 3.3.3 tuple encoders do not correctly casting
null into None for Option values)
> Spark 3.3.3 tuple encoders do not correctly cast null into None for Option
> values
> ---------------------------------------------------------------------------------
>
> Key: SPARK-46251
> URL: https://issues.apache.org/jira/browse/SPARK-46251
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.3.3, 3.4.2, 3.4.0, 3.4.1, 3.5.0
> Reporter: Will Boulter
> Priority: Major
>
> In Spark `3.3.2`, encoders created using `Encoders.tuple(encoder1, encoder2,
> ..)` correctly handle casting `null` into `None` when the target type is an
> `Option`.
>
> In Spark `3.3.3`, this behaviour has changed and the Option value comes
> through as `null` which is likely to cause a `NullPointerException` for most
> Scala code that operates on the Option. The change seems to be related to the
> following commit:
> [https://github.com/apache/spark/commit/9110c05d54c392e55693eba4509be37c571d610a]
>
> I have made a reproduction with a couple of examples in a public Github repo
> here:
> [https://github.com/q-willboulter/spark-tuple-encoders-bug]
>
> The common use case where this is likely to be encountered is while doing any
> joins that can return null, e.g. left or outer joins. When casting the result
> of a left join it is sensible to wrap the right-hand side in an Option to
> handle the case where there is no match - since 3.3.3 this could fail if the
> encoder is derived manually using `Encoders.tuple(leftEncoder,
> rightEncoder)`. If the entire tuple encoder `Encoder[(Left, Option[Right]])`
> is derived at once, the encoder works as expected - the bug appears to be in
> the following function inside `ExpressionEncoder.scala`
> ```
> def tuple(encoders: Seq[ExpressionEncoder[_]]): ExpressionEncoder[_] = ...
> ```
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