alamb opened a new issue #144:
URL: https://github.com/apache/arrow-datafusion/issues/144


   *Note*: migrated from original JIRA: 
https://issues.apache.org/jira/browse/ARROW-11164
   
   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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