szehon-ho commented on code in PR #53360:
URL: https://github.com/apache/spark/pull/53360#discussion_r2615037235
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/AssignmentUtils.scala:
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@@ -223,6 +304,75 @@ object AssignmentUtils extends SQLConfHelper with
CastSupport {
CreateNamedStruct(namedStructExprs)
}
+ /**
+ * Checks if target struct has extra fields compared to source struct,
recursively.
+ */
+ private def hasExtraTargetFields(targetType: StructType, sourceType:
DataType): Boolean = {
+ sourceType match {
+ case sourceStructType: StructType =>
+ targetType.fields.exists { targetField =>
+ sourceStructType.fields.find(f => conf.resolver(f.name,
targetField.name)) match {
+ case Some(sourceField) =>
+ // Check nested structs recursively
+ (targetField.dataType, sourceField.dataType) match {
+ case (targetNested: StructType, sourceNested) =>
+ hasExtraTargetFields(targetNested, sourceNested)
+ case _ => false
+ }
+ case None => true // target has extra field not in source
+ }
+ }
+ case _ =>
Review Comment:
yes actually its covered by the test
https://github.com/apache/spark/blob/master/sql/core/src/test/scala/org/apache/spark/sql/connector/MergeIntoTableSuiteBase.scala#L2915
, changed to throw an exception
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