maropu commented on a change in pull request #31843:
URL: https://github.com/apache/spark/pull/31843#discussion_r595948276
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/complexTypeCreator.scala
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@@ -339,6 +339,14 @@ object CreateStruct {
*/
def apply(children: Seq[Expression]): CreateNamedStruct = {
CreateNamedStruct(children.zipWithIndex.flatMap {
+ // For multi-part column name like `struct(a.b.c)`, it may be resolved
into:
+ // 1. Attribute if `a.b.c` is simply a qualified column name.
+ // 2. GetStructField if `a.b` refers to a struct-type column.
+ // 3. GetArrayStructFields if `a.b` refers to a array-of-struct-type
column.
+ // 4. GetMapValue if `a.b` refers to a map-type column.
+ // We should always use the last part of the column name (`c` in the
above example) as the
+ // alias name inside CreateNamedStruct.
+ case (u: UnresolvedAttribute, _) => Seq(Literal(u.nameParts.last), u)
Review comment:
Ah, I see. This change makes `ResolveCreateNamedStruct` simpler. The fix
seems smart.
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