Github user maropu commented on a diff in the pull request:
https://github.com/apache/spark/pull/20757#discussion_r182903518
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/objects/objects.scala
---
@@ -1615,13 +1616,50 @@ case class ValidateExternalType(child: Expression,
expected: DataType)
override def nullable: Boolean = child.nullable
- override def dataType: DataType =
RowEncoder.externalDataTypeForInput(expected)
-
- override def eval(input: InternalRow): Any =
- throw new UnsupportedOperationException("Only code-generated
evaluation is supported")
+ override val dataType: DataType =
RowEncoder.externalDataTypeForInput(expected)
private val errMsg = s" is not a valid external type for schema of
${expected.simpleString}"
+ // This function is corresponding to `CodeGenerator.boxedType`
+ private def boxedType(dt: DataType): Class[_] = dataType match {
--- End diff --
ok
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