[jira] [Created] (ARROW-11164) [Rust][DataFusion] Implement optional second argument to ltrim and rtrim functions

["Andrew Lamb (Jira)" <ji...@apache.org>]

Andrew Lamb created ARROW-11164:
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             Summary: [Rust][DataFusion] Implement optional second argument to ltrim and rtrim functions
                 Key: ARROW-11164
                 URL: https://issues.apache.org/jira/browse/ARROW-11164
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Rust - DataFusion
            Reporter: Andrew Lamb
         Attachments: 103891510-f84d8800-50b7-11eb-929e-94f56c2364cd.png

https://github.com/apache/arrow/pull/9108 adds the ltrim and rtrim functions to datafusion, following postgres. However, postgres offers a second optional argument (the character to trim) that is not yet implemented, as described on https://www.postgresql.org/docs/9.1/functions-string.html

For example:
 !103891510-f84d8800-50b7-11eb-929e-94f56c2364cd.png! 


This ticket tracks the work to add support for the second optional arguments (what character to trim) - it would probably be a good introductory item for new contributors.

There is more context here:
https://github.com/apache/arrow/pull/9108#pullrequestreview-563440252



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