Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/9940#discussion_r46086790
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala ---
@@ -352,24 +352,33 @@ object StructType extends AbstractDataType {
case (StructType(leftFields), StructType(rightFields)) =>
val newFields = ArrayBuffer.empty[StructField]
+ val oneSide = new MetadataBuilder()
val rightMapped = fieldsMap(rightFields)
leftFields.foreach {
case leftField @ StructField(leftName, leftType, leftNullable,
_) =>
rightMapped.get(leftName)
.map { case rightField @ StructField(_, rightType,
rightNullable, _) =>
+ oneSide.putBoolean("oneSide", false)
leftField.copy(
dataType = merge(leftType, rightType),
- nullable = leftNullable || rightNullable)
+ nullable = leftNullable || rightNullable,
+ metadata = oneSide.build())
}
--- End diff --
Indentation of the `map` block is off, please help fixing it. Thanks.
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