maropu commented on a change in pull request #29587:
URL: https://github.com/apache/spark/pull/29587#discussion_r479980351
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/types/StructType.scala
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@@ -641,4 +641,30 @@ object StructType extends AbstractDataType {
fields.foreach(s => map.put(s.name, s))
map
}
+
+ /**
+ * Returns a `StructType` that contains missing fields recursively from
`source` to `target`.
+ * Note that this doesn't support looking into array type and map type
recursively.
+ */
+ def findMissingFields(source: StructType, target: StructType, resolver:
Resolver): StructType = {
Review comment:
We need to define this method in the `StructType` side instead of a
private method in `ResolveUnion`?
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