[jira] [Created] (CALCITE-6719) CODE_POINTS_TO_STRING、CODE_POINTS_TO_BYTES and TO_CODE_POINTS's return type should be nullable when return the NULL value

[xiong duan (Jira)]

xiong duan created CALCITE-6719:
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             Summary: CODE_POINTS_TO_STRING、CODE_POINTS_TO_BYTES and 
TO_CODE_POINTS's return type should be nullable when return the NULL value
                 Key: CALCITE-6719
                 URL: https://issues.apache.org/jira/browse/CALCITE-6719
             Project: Calcite
          Issue Type: Bug
            Reporter: xiong duan
             Fix For: 1.39.0


For example:
{code:java}
code_points_to_bytes(array[null]); reuturn null but the return data type is 
non-nullable
code_points_to_string(array[null]); reuturn null but the return data type is 
non-nullable
to_code_points(''); reuturn null reuturn null but the return data type is 
non-nullable{code}



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