jackwener commented on code in PR #4272:
URL: https://github.com/apache/arrow-datafusion/pull/4272#discussion_r1026185811
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datafusion/optimizer/src/eliminate_outer_join.rs:
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@@ -39,191 +38,107 @@ impl ReduceOuterJoin {
}
}
+/// Attempt to eliminate outer joins to inner joins.
Review Comment:
You can see `fn eliminate_outer()`
Your example, this rule can do.
We can eliminate Full -> ROJ/LOJ/Inner
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