maropu commented on issue #27235: [SPARK-30527][SQL] Add IsNotNull filter when 
use In, InSet and InSubQuery
URL: https://github.com/apache/spark/pull/27235#issuecomment-575083216
 
 
   Are they NULL intolerant?
   ```
   postgres=# \pset null 'NULL'
   Null display is "NULL".
   postgres=# select * from t;
     k   |  v   
   ------+------
    NULL | NULL
   (1 row)
   
   postgres=# select * from t where v in (1, 2);
    k | v 
   ---+---
   (0 rows)
   ```

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