Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/20176#discussion_r160307985
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -259,6 +259,29 @@ case class Cast(child: Expression, dataType: DataType,
timeZoneId: Option[String
builder.append("]")
builder.build()
})
+ case StructType(fields) =>
+ buildCast[InternalRow](_, row => {
+ val builder = new UTF8StringBuilder
+ builder.append("[")
+ if (row.numFields > 0) {
--- End diff --
do we need this? even `row.numFields == 0`, the following code is a no-op
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