clintropolis opened a new pull request, #15909:
URL: https://github.com/apache/druid/pull/15909

   ### Description
   Fixes an issue of the SQL return type inference of `PARSE_LONG`, which was 
incorrectly using cascade nullable when instead it is always nullable (such as 
a non-null input string not being able to be parsed into a number). This 
becomes problematic when used in a filter involving nulls as the planner would 
incorrectly optimize it to always true/false depending on is null/ not null.
   
   <hr>
   
   This PR has:
   
   - [x] been self-reviewed.
   - [x] added unit tests or modified existing tests to cover new code paths, 
ensuring the threshold for [code 
coverage](https://github.com/apache/druid/blob/master/dev/code-review/code-coverage.md)
 is met.
   - [x] been tested in a test Druid cluster.
   


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