cloud-fan commented on code in PR #38345:
URL: https://github.com/apache/spark/pull/38345#discussion_r1004022886
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connector/connect/src/main/protobuf/spark/connect/relations.proto:
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@@ -109,6 +109,10 @@ message Join {
Relation right = 2;
Expression join_condition = 3;
JoinType join_type = 4;
+ // Optional. using_columns provides a list of columns that should present on
both sides of
+ // the join inputs that this Join will join on. For example A JOIN B USING
col_name is
+ // equivalent to A JOIN B on A.col_name = B.col_name.
Review Comment:
let's also mention that this can't co-exist with `join_condition`
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