peterxcli opened a new pull request, #5045:
URL: https://github.com/apache/datafusion-comet/pull/5045

   ## Which issue does this PR close?
   
   Closes #3389.
   
   ## Rationale for this change
   
   The native cast path supports `NullArray` casts, but the planner rejected 
`NullType` map elements before they reached it.
   
   ## What changes are included in this PR?
   
   - Treat `NullType` casts as compatible with native execution.
   - Require native coverage for numeric-key and empty-map `map_contains_key` 
cases.
   
   ## How are these changes tested?
   
   - `make core`
   - `./mvnw test -Pjdk17 -Dtest=none 
-Dsuites='org.apache.comet.CometSqlFileTestSuite map_contains_key.sql'`
   


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