amaliujia commented on code in PR #38276:
URL: https://github.com/apache/spark/pull/38276#discussion_r997473877
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -163,6 +164,14 @@ message Sort {
}
}
+// Relation of type [[Deduplicate]] which have duplicate rows removed, could
consider either only
+// the subset of columns or all the columns.
+message Deduplicate {
+ Relation input = 1;
+ repeated string deduplicate_columns = 2;
+ bool is_all = 3;
Review Comment:
It is a nice convenience that users do not want to know the previous schema
of the LogicalPlan but just want to chain a `DISTINCT`. In this case users
leave the backend to resolve the complete schema of the previous operation.
Though users can `val t = df.schema(); df.deduplicate(t)`
Well from another perspective if we want to match existing DataFrame API
(which is `distinct()`) this becomes a necessary
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