andygrove opened a new issue, #2381:
URL: https://github.com/apache/arrow-datafusion/issues/2381
**Describe the bug**
See unit test below.
**To Reproduce**
``` rust
#[tokio::test]
async fn nested_subquery() -> Result<()> {
let ctx = SessionContext::new();
let schema = Schema::new(vec![
Field::new("id", DataType::Int16, false),
Field::new("a", DataType::Int16, false),
]);
let empty_table = Arc::new(EmptyTable::new(Arc::new(schema)));
ctx.register_table("t1", empty_table.clone())?;
ctx.register_table("t2", empty_table)?;
let sql = "SELECT COUNT(*) \
FROM (\
(SELECT id FROM t1) EXCEPT \
(SELECT id FROM t2)\
) foo";
let actual = execute_to_batches(&ctx, sql).await;
// the purpose of this test is just to make sure the query produces a
valid plan
let expected = vec!["++", "++"];
assert_batches_eq!(expected, &actual);
Ok(())
}
```
Fails with:
```
NotImplemented(\"Query (SELECT id FROM t1) not implemented yet\")
```
**Expected behavior**
Test should pass
**Additional context**
None
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