Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/4602#discussion_r28575756
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -42,47 +42,27 @@ abstract class Generator extends Expression {
override type EvaluatedType = TraversableOnce[Row]
- override lazy val dataType =
- ArrayType(StructType(output.map(a => StructField(a.name, a.dataType,
a.nullable, a.metadata))))
+ override def dataType: DataType = ???
--- End diff --
As we moved the output field names from the `Generator` to `Generate`,
probably it's impossible to construct the `StructType` any more within the
`Generator`. And, it will be the rare case to the `dataType` method of a
`Generator`, how about keep throwing exception if people do that?
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