amaliujia commented on code in PR #38973:
URL: https://github.com/apache/spark/pull/38973#discussion_r1042904146
##########
connector/connect/common/src/main/protobuf/spark/connect/relations.proto:
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@@ -570,3 +571,21 @@ message Hint {
// (Optional) Hint parameters.
repeated Expression.Literal parameters = 3;
}
+
+// Unpivot a DataFrame from wide format to long format, optionally leaving
identifier columns set.
+message Melt {
+ // (Required) The input relation.
+ Relation input = 1;
+
+ // (Required) Id columns.
+ repeated Expression ids = 2;
Review Comment:
Yes Expression is right. Honestly I think Expression is used more often than
`Column` for relational world
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