ulysses-you 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-575565262
 
 
   Find the reason why test failed. `Not In` is quite complex. As 
`not-in-unit-tests-single-column.sql` say
   
   > -- Test cases for single-column ``WHERE a NOT IN (SELECT c FROM r ...)'':
   > -- | # | does subquery include null? | is a null? | a = c? | row with a 
included in result? |
   > -- | 1 | empty                       |            |        | yes           
                 |
   > -- | 2 | yes                         |            |        | no            
                 |
   > -- | 3 | no                          | yes        |        | no            
                 |
   > -- | 4 | no                          | no         | yes    | no            
                 |
   > -- | 5 | no                          | no         | no     | yes           
                 |
   
   Close this pr first and check offline if exists better way.

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