kosiew commented on code in PR #16696:
URL: https://github.com/apache/datafusion/pull/16696#discussion_r2241482599
##########
datafusion/optimizer/src/optimize_projections/mod.rs:
##########
@@ -826,6 +840,34 @@ pub fn is_projection_unnecessary(
))
}
+fn plan_contains_subquery_alias(plan: &LogicalPlan) -> bool {
+ // ambiguity of aliases can arise if there are
Review Comment:
https://github.com/kosiew/datafusion/blob/7e6ef3a77490a426c3f3416033a3dd3eb288ab59/datafusion/optimizer/src/optimize_projections/mod.rs#L353-L362
caused this slt test to fail
```
External error: 1 errors in file
/Users/kosiew/GitHub/datafusion/datafusion/sqllogictest/test_files/cte.slt
1. query failed: DataFusion error: Optimizer rule 'optimize_projections'
failed
caused by
Schema error: No field named __scalar_sq_1.prices_row_num. Did you mean
'__scalar_sq_3.prices_row_num'?.
[SQL] WITH RECURSIVE "recursive_cte" AS (
...
```
https://github.com/kosiew/datafusion/blob/a289237acc769fb787365780a51d8e8ea5be71e4/datafusion/sqllogictest/test_files/cte.slt#L408-L414
After a lot of investigation, I found that it failed because the recursive
cte has several subquery aliases.
Instead of tweaking subquery aliases for recursive ctes, I added a bypass
for recursive ctes with 2 or more subquery aliases.
https://github.com/kosiew/datafusion/blob/a289237acc769fb787365780a51d8e8ea5be71e4/datafusion/optimizer/src/optimize_projections/mod.rs#L353-L356
which enabled the slt test to pass.
I thought this was an improvement because before this change, recursive
queries were not transformed by optimize_projections at all.
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