Daniel created SPARK-40618:
------------------------------
Summary: Bug in MergeScalarSubqueries rule attempting to merge
nested subquery with parent
Key: SPARK-40618
URL: https://issues.apache.org/jira/browse/SPARK-40618
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.4.0
Reporter: Daniel
There is a bug in the `MergeScalarSubqueries` rule for queries with subquery
expressions nested inside each other, wherein the rule attempts to merge the
nested subquery with its enclosing parent subquery. The result is not a valid
plan and raises an exception in the optimizer. Here is a minimal reproducing
case:
```
sql("create table test(col int) using csv")
checkAnswer(sql("select(select sum((select sum(col) from test)) from test)"),
Row(null))
```
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