[GitHub] [arrow-datafusion] osawyerr commented on issue #6508: octet_length(char) doesn't behave as expected.

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

osawyerr commented on issue #6508:
URL: https://github.com/apache/arrow-datafusion/issues/6508#issuecomment-1572835492

   @alamb There is also a related point RE how ``char``s are handles in joins and equality in postgres vs. ``varchar``as well. In postgres if I recall, the trailing spaces are ignored when comparing ``char``s but are taken into account when comparing ``varchar``s. 
   
   From your explanation, DataFusion will always take into account the trailing spaces if a "``char``" is used in a join / equality. i.e. it will behave like a postgres ``varchar``.
   
   i.e. 
   ```sql
   -- note the trailing spaces below
   select * from example where name::char(25) = 'foo    '::char(25) 
   ```
   
   Will return no results in DataFusion but in postgres the result will be returned.


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