Wen Yuen Pang created SPARK-44934:
-------------------------------------
Summary: PushdownPredicatesAndPruneColumnsForCTEDef creates
invalid plan when called over CTE with duplicate attributes
Key: SPARK-44934
URL: https://issues.apache.org/jira/browse/SPARK-44934
Project: Spark
Issue Type: Bug
Components: Optimizer
Affects Versions: 3.4.1
Reporter: Wen Yuen Pang
When running the query
```
with cte as (
select c1, c1, c2, c3 from t where random() > 0
)
select cte.c1, cte2.c1, cte.c2, cte2.c3 from
(select c1, c2 from cte) cte
inner join
(select c1, c3 from cte) cte2
on cte.c1 = cte2.c1
```
The query fails with the error
```
org.apache.spark.scheduler.DAGScheduler: Failed to update accumulator 9523
(Unknown class) for task 1
org.apache.spark.SparkException: attempted to access non-existent accumulator
9523
```
Further investigation shows that the rule
`PushdownPredicatesAndPruneColumnsForCTEDef` creates an invalid plan when the
output of a CTE contains duplicate expression IDs.
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