xudong963 commented on a change in pull request #1259:
URL: https://github.com/apache/arrow-datafusion/pull/1259#discussion_r744261299
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File path: datafusion/src/sql/planner.rs
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@@ -195,26 +195,42 @@ impl<'a, S: ContextProvider> SqlToRel<'a, S> {
} => {
let left_plan = self.set_expr_to_plan(left.as_ref(), None,
ctes)?;
let right_plan = self.set_expr_to_plan(right.as_ref(), None,
ctes)?;
+ let join_keys = left_plan
Review comment:
I add an `if`, only `intersect` and `except` will get `join_keys`
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