Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17623#discussion_r112703773
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeExtractors.scala
---
@@ -111,6 +111,11 @@ case class GetStructField(child: Expression, ordinal:
Int, name: Option[String]
override def dataType: DataType = childSchema(ordinal).dataType
override def nullable: Boolean = child.nullable ||
childSchema(ordinal).nullable
+ override def verboseString: String = {
--- End diff --
so `verboseString` must use function-style format like `func(x1, x2)`?
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