Xiangrui Meng created SPARK-25378:
-------------------------------------

             Summary: ArrayData.toArray assume UTF8String
                 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


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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