Dandandan commented on code in PR #13025:
URL: https://github.com/apache/datafusion/pull/13025#discussion_r1809199012
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datafusion/optimizer/src/eliminate_cross_join.rs:
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@@ -253,13 +269,7 @@ fn flatten_join_inputs(
fn can_flatten_join_inputs(plan: &LogicalPlan) -> bool {
// can only flatten inner / cross joins
Review Comment:
I think the reason is that the current code doesn't support that / it's not
obvious how it could work for non-inner joins.
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