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https://issues.apache.org/jira/browse/SPARK-21445?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16090813#comment-16090813
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Apache Spark commented on SPARK-21445:
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User 'brkyvz' has created a pull request for this issue:
https://github.com/apache/spark/pull/18660
> NotSerializableException thrown by UTF8String.IntWrapper
> --------------------------------------------------------
>
> Key: SPARK-21445
> URL: https://issues.apache.org/jira/browse/SPARK-21445
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Burak Yavuz
>
> {code}
> Caused by: java.io.NotSerializableException:
> org.apache.spark.unsafe.types.UTF8String$IntWrapper
> Serialization stack:
> - object not serializable (class:
> org.apache.spark.unsafe.types.UTF8String$IntWrapper, value:
> org.apache.spark.unsafe.types.UTF8String$IntWrapper@326450e)
> - field (class:
> org.apache.spark.sql.catalyst.expressions.Cast$$anonfun$castToInt$1, name:
> result$2, type: class org.apache.spark.unsafe.types.UTF8String$IntWrapper)
> - object (class
> org.apache.spark.sql.catalyst.expressions.Cast$$anonfun$castToInt$1,
> <function1>)
> {code}
> Not exactly sure in which specific case this exception is thrown, because I
> couldn't come up with a simple reproducer yet, but will include a test in the
> PR
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