itschrispeck opened a new pull request, #13527:
URL: https://github.com/apache/pinot/pull/13527

   We've seen some NPEs caused by certain combinations of filters, namely when 
the filtering follows the pattern:
   `WHERE NOT (<scan filter> AND <filter on transform function>)`, and the 
docIds returned by the `<filter on transform function>` are less than the doc 
Ids from the proceeding `<scan filter>`. 
   
   example stack trace:
   ```
   java.lang.NullPointerException
        at 
org.apache.pinot.core.operator.dociditerators.ExpressionScanDocIdIterator.advance(ExpressionScanDocIdIterator.java:111)
        at 
org.apache.pinot.core.operator.dociditerators.AndDocIdIterator.next(AndDocIdIterator.java:51)
        at 
org.apache.pinot.core.operator.dociditerators.NotDocIdIterator.next(NotDocIdIterator.java:48)
        at 
org.apache.pinot.core.operator.DocIdSetOperator.getNextBlock(DocIdSetOperator.java:75)
        at 
org.apache.pinot.core.operator.DocIdSetOperator.getNextBlock(DocIdSetOperator.java:39)
   ```
   
   I'm not totally sure this is the best way to fix it - the bug is easily 
reproducible w/ the added unit test `testTransformDocIdsLessThanFiltered`. 


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