ygf11 commented on code in PR #4862:
URL: https://github.com/apache/arrow-datafusion/pull/4862#discussion_r1067929192
##########
datafusion/expr/src/expr_rewriter.rs:
##########
@@ -525,29 +525,55 @@ pub fn coerce_plan_expr_for_schema(
plan: &LogicalPlan,
schema: &DFSchema,
) -> Result<LogicalPlan> {
- let new_expr = plan
- .expressions()
- .into_iter()
+ match plan {
+ LogicalPlan::Projection(Projection { expr, input, .. }) => {
Review Comment:
Yes, it is to avoid adding multiple projections.
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