zhengruifeng commented on code in PR #38973:
URL: https://github.com/apache/spark/pull/38973#discussion_r1043095105
##########
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 {
Review Comment:
since `melt` == `unpivot`, and `Unpivot` is just a logical plan, so I
suggest to rename it `Unpivot`
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