Github user gatorsmile commented on the issue:
https://github.com/apache/spark/pull/18968
We do allow multiple columns in `IN subquery`. For example,
```SQL
SELECT t1a,
t1b,
t1d
FROM t1
WHERE ( t1b, t1d ) IN (SELECT t2b,
t2d
FROM t2
WHERE t2i IN (SELECT t3i
FROM t3
WHERE t2b > t3b))
```
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