jackwener commented on code in PR #8438:
URL: https://github.com/apache/arrow-datafusion/pull/8438#discussion_r1418253641
##########
datafusion/optimizer/src/optimize_projections.rs:
##########
@@ -405,9 +405,25 @@ fn merge_consecutive_projections(proj: &Projection) ->
Result<Option<Projection>
.iter()
.map(|expr| rewrite_expr(expr, prev_projection))
.collect::<Result<Option<Vec<_>>>>()?;
- new_exprs
- .map(|exprs| Projection::try_new(exprs, prev_projection.input.clone()))
- .transpose()
+ if let Some(new_exprs) = new_exprs {
+ let new_exprs = new_exprs
+ .into_iter()
+ .zip(proj.expr.iter())
+ .map(|(new_expr, old_expr)| {
+ let new_name = new_expr.name_for_alias()?;
+ let old_name = old_expr.name_for_alias()?;
+ Ok(if new_name != old_name {
+ // Make sure name is preserved after merging
+ new_expr.alias(old_name)
+ } else {
+ new_expr
+ })
Review Comment:
```suggestion
new_expr.alias_if_changed(old_expr.name_for_alias()?)
```
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