Github user srinathshankar commented on the issue:
https://github.com/apache/spark/pull/15763
As it stands the check seems overly aggressive. The following works:
```sql
select t1.c1
from t1
where t1.c1 in (
select c1 + 1 as col
from t2
where t1.c2 < t2.c2)
```
```
scala> sql("select t1.c1 from t1 where t1.c1 in (select c1 + 1 as col from
t2 where t1.c2 < t2.c2)").show()
+---+
| c1|
+---+
+---+
```
But the following, when I wrap the subselect with a project, does not
```sql
select t1.c1
from t1
where t1.c1 in (
select col + 1
from (
select c1 as col
from t2
where t1.c2 < t2.c2))
```
```
scala> sql("select t1.c1 from t1 where t1.c1 in (select col + 1 from
(select c1 as col from t2 where t1.c2 < t2.c2))").show()
org.apache.spark.sql.AnalysisException: Correlated column is not allowed in
a non-equality predicate:
Project [(col#29 + 1) AS (col + 1)#32]
+- Project [(c1#16 + 1) AS col#29]
+- Filter (outer(c2#6) < c2#17)
+- SubqueryAlias t2
+- Project [_1#13 AS c1#16, _2#14 AS c2#17]
+- LocalRelation [_1#13, _2#14]
;
```
Is this intentional ?
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