andygrove commented on code in PR #3880:
URL: https://github.com/apache/arrow-datafusion/pull/3880#discussion_r998448651
##########
datafusion/optimizer/src/projection_push_down.rs:
##########
@@ -509,7 +509,25 @@ fn optimize_plan(
from_plan(plan, &expr, &new_inputs)
}
- }
+ };
+
+ // when this rule is applied multiple times it will insert duplicate
nested projections,
+ // so we catch this here
+ let with_dupe_projection_removed = match new_plan? {
+ LogicalPlan::Projection(p) => match p.input.as_ref() {
+ LogicalPlan::Projection(p2) if projection_equal(&p, p2) => {
+ LogicalPlan::Projection(p2.clone())
+ }
+ _ => LogicalPlan::Projection(p),
+ },
+ other => other,
+ };
Review Comment:
This is the fix for https://github.com/apache/arrow-datafusion/issues/3881
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