viirya commented on a change in pull request #1319:
URL: https://github.com/apache/arrow-datafusion/pull/1319#discussion_r752840803
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File path: datafusion/src/optimizer/constant_folding.rs
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@@ -101,7 +105,30 @@ impl OptimizerRule for ConstantFolding {
// fold constants and then simplify
.rewrite(&mut const_evaluator)?
.rewrite(&mut simplifier)?;
- Ok(new_e)
+
+ let new_name = &new_e.name(plan.schema());
+
+ // Some plans will be candidates in projection
pushdown rule to
+ // trim expressions based on expression names. We need
to keep
+ // expression name for them.
+ let is_plan_for_projection_pushdown = matches!(
+ plan,
+ LogicalPlan::Window { .. }
Review comment:
Not these approaches can work except the previous commit. Field name
isn't equal to expression name for all cases. The cause of the problem is
highly coupled with how projection push down rule works. Currently I don't find
a solution to deal with all nodes other than current working version.
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