qrilka commented on issue #130:
URL: 
https://github.com/apache/arrow-datafusion/issues/130#issuecomment-1746239806

   @alamb wasn't it implemented already? E.g. in datafusion-cli I see:
   ```
   ❯ select char_length(null),a from test;
   +------------------------+---+
   | character_length(NULL) | a |
   +------------------------+---+
   |                        | 1 |
   |                        | 2 |
   +------------------------+---+
   2 rows in set. Query took 0.001 seconds.
   
   ❯ select null;
   +------+
   | NULL |
   +------+
   |      |
   +------+
   1 row in set. Query took 0.002 seconds.
   ❯ CREATE TABLE test1 AS
   SELECT NULL;
   0 rows in set. Query took 0.010 seconds.
   
   ❯ select * from test1;
   +------+
   | NULL |
   +------+
   |      |
   +------+
   1 row in set. Query took 0.002 seconds.
   ```
   
   So it seems to me that the described use cases are already supported


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