andygrove opened a new issue, #2238:
URL: https://github.com/apache/arrow-datafusion/issues/2238
**Is your feature request related to a problem or challenge? Please describe
what you are trying to do.**
As a user of the DataFusion library for SQL parsing and logical query
planning, I would like to be able to produce a valid logical plan from a SQL
query containing a simple nested subquery instead of failing with `Unsupported
ast node Query`.
Example query: `SELECT name FROM (SELECT * FROM t2 WHERE id > 1) WHERE id <
4`
**Describe the solution you'd like**
The SQL should parse without error and produce a valid logical plan.
For reference, here is an example query and logical plan from Apache Spark:
```
scala> val df = spark.sql("SELECT name FROM (SELECT * FROM t2 WHERE id > 1)
WHERE id < 4")
df: org.apache.spark.sql.DataFrame = [id: int, name: string]
scala> df.queryExecution.logical
res5: org.apache.spark.sql.catalyst.plans.logical.LogicalPlan =
'Project ['name]
+- 'Filter ('id < 4)
+- 'SubqueryAlias __auto_generated_subquery_name
+- 'Project [*]
+- 'Filter ('id > 1)
+- 'UnresolvedRelation [t2], [], false
```
**Describe alternatives you've considered**
None
**Additional context**
This does not cover optimization or physical plan. We will need to file
follow-on issues for those.
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