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Posted to jira@arrow.apache.org by "Andrew Lamb (Jira)" <ji...@apache.org> on 2021/03/03 11:50:00 UTC

[jira] [Created] (ARROW-11851) [Rust][DataFusion] Add coercion support for `NULL` literals

Andrew Lamb created ARROW-11851:
-----------------------------------

             Summary: [Rust][DataFusion] Add coercion support for `NULL` literals
                 Key: ARROW-11851
                 URL: https://issues.apache.org/jira/browse/ARROW-11851
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust - DataFusion
            Reporter: Andrew Lamb


As we observed in https://github.com/apache/arrow/pull/9565#discussion_r586347165 datafusion won't coerce null literals, forcing strange syntax such as:

```
rpad('hi', CAST(NULL AS INT), 'xy')

We should add automatic coercion logic from the null literal to any type and this expression should work just fine (produce a NULL output)

```
rpad('hi', NULL, 'xy')
```



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