Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/12810#discussion_r61991082
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/generators.scala
---
@@ -41,19 +41,17 @@ import org.apache.spark.sql.types._
*/
trait Generator extends Expression {
- // TODO ideally we should return the type of ArrayType(StructType),
- // however, we don't keep the output field names in the Generator.
- override def dataType: DataType = throw new UnsupportedOperationException
+ override def dataType: DataType = ArrayType(elementSchema)
override def foldable: Boolean = false
override def nullable: Boolean = false
/**
- * The output element data types in structure of Seq[(DataType,
Nullable)]
+ * The output element schema.
* TODO we probably need to add more information like metadata etc.
--- End diff --
I did not know either
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