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https://issues.apache.org/jira/browse/SPARK-25378?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16612947#comment-16612947
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Wenchen Fan commented on SPARK-25378:
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[~viirya] Can you take a look and see how hard it is to fix it?
After a quick look, I think this works in 2.3 if and only if: the
`GenericArrayData` is created with `Array[String]` (i.e. a malformed
ArrayData), and we wrongly call the `toArray[String](StringType)` method.
A quick solution is to revert SPARK-23875 from 2.4, but then we sacrifice
performance to retain a buggy but backward-compatible behavior. So we need to
make a trade off here.
> ArrayData.toArray(StringType) assume UTF8String in 2.4
> ------------------------------------------------------
>
> Key: SPARK-25378
> URL: https://issues.apache.org/jira/browse/SPARK-25378
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0
> Reporter: Xiangrui Meng
> Priority: Critical
>
> The following code works in 2.3.1 but failed in 2.4.0-SNAPSHOT:
> {code}
> import org.apache.spark.sql.catalyst.util._
> import org.apache.spark.sql.types.StringType
> ArrayData.toArrayData(Array("a", "b")).toArray[String](StringType)
> res0: Array[String] = Array(a, b)
> {code}
> In 2.4.0-SNAPSHOT, the error is
> {code}java.lang.ClassCastException: java.lang.String cannot be cast to
> org.apache.spark.unsafe.types.UTF8String
> at
> org.apache.spark.sql.catalyst.util.GenericArrayData.getUTF8String(GenericArrayData.scala:75)
> at
> org.apache.spark.sql.catalyst.InternalRow$$anonfun$getAccessor$8.apply(InternalRow.scala:136)
> at
> org.apache.spark.sql.catalyst.InternalRow$$anonfun$getAccessor$8.apply(InternalRow.scala:136)
> at org.apache.spark.sql.catalyst.util.ArrayData.toArray(ArrayData.scala:178)
> ... 51 elided
> {code}
> cc: [~cloud_fan] [~yogeshg]
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