andygrove commented on issue #25981:
URL: https://github.com/apache/datafusion/issues/25981#issuecomment-6698731954

   Running `array_contains.slt` on Spark 4.2.0 with the runner in #27165 found 
one more difference. An untyped `NULL` argument returns NULL in DataFusion, but 
Spark rejects it during analysis:
   
   ```sql
   SELECT array_contains(NULL, 1)
   SELECT array_contains(array(1, 2, 3), NULL)
   -- [DATATYPE_MISMATCH.NULL_TYPE] Cannot resolve "array_contains(NULL, 1)" 
due to data type mismatch: Null typed values cannot be used as arguments of 
`array_contains`. SQLSTATE: 42K09
   ```
   
   Spark has rejected these in every version from 3.4 to 4.2, so this does not 
depend on the Spark version.
   


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