[GitHub] [arrow-datafusion] nevi-me opened a new issue #507: Support pruning on string columns using starts_with

[GitBox <gi...@apache.org>]

nevi-me opened a new issue #507:
URL: https://github.com/apache/arrow-datafusion/issues/507


   **Is your feature request related to a problem or challenge? Please describe what you are trying to do.**
   
   From looking at the pruning logic, it appears that we can prune inputs based on `col = 'string_value'`, but we can't prune on `col LIKE 'value%'`.
   
   We should be able to support `LIKE` and `NOT LIKE`.
   
   **Describe the solution you'd like**
   
   Extend the pruning logic to generate a pruning filter for `LIKE` and `NOT LIKE`.
   
   **Describe alternatives you've considered**
   
   None
   
   **Additional context**
   
   Spark will push down a `LIKE` filter if it can be converted to a `starts_with`, normally by checking if the string doesn't start with `%`. 


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