[I] `flatten` mishandles NULL values with non-empty offset ranges [datafusion]

["neilconway (via GitHub)" <gi...@apache.org>]

neilconway opened a new issue, #25224:
URL: https://github.com/apache/datafusion/issues/25224

   ### Describe the bug
   
   See #25222, #25223, #25210 for related bugs.
   
   ### To Reproduce
   
   ```sql
     CREATE TABLE t AS VALUES ([1,2,3], [1,2,3], 1), ([4,5,6], [7], 2);
     CREATE VIEW v AS SELECT column3 AS id, column1 AS l, NULLIF(column1, column2) AS nl FROM t;
   
     SELECT id, flatten(array_append([[9]], nl)) FROM v ORDER BY id;
     -- row 1: [9, 1, 2, 3]   expected [9]
   
     SELECT id, array_agg(nl) AS agg, flatten(array_agg(nl)) FROM v GROUP BY id ORDER BY id;
     -- row 1: agg = [NULL], flatten = [1, 2, 3]   expected []
   
     SELECT flatten([arrow_cast([1,2,3], 'FixedSizeList(3, Int64)'), arrow_cast(NULL, 'FixedSizeList(3, Int64)')]);
     -- [1, 2, 3, NULL, NULL, NULL]   expected [1, 2, 3]
   ```
   
   ### Expected behavior
   
   _No response_
   
   ### Additional context
   
   _No response_


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Re: [I] `flatten` mishandles NULL values with non-empty offset ranges [datafusion]

["vibhuthespeedst (via GitHub)" <gi...@apache.org>]

vibhuthespeedst commented on issue #25224:
URL: https://github.com/apache/datafusion/issues/25224#issuecomment-6508390106

   take


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