[GitHub] [arrow-datafusion] tobyhede opened a new issue #1429: regex_match does not compile using the `g` flag

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

tobyhede opened a new issue #1429:
URL: https://github.com/apache/arrow-datafusion/issues/1429


   **Describe the bug**
   The regexp_match function fails to compile when supplied a `g` flag.
   
   **To Reproduce**
   At the moment many functions including regex match are not working correctly when accessed directly via the dataframe interface (I am working on a fix for this). 
   To reproduce this bug, setup a test in functions.rs
   ```
       test_function!(
               RegexpMatch,
               &[
                   lit(ScalarValue::Utf8(Some("abc".to_string()))),
                   lit(ScalarValue::Utf8(Some("a..".to_string()))),
                   lit(ScalarValue::Utf8(Some("g".to_string()))),
               ],
               Ok(Some("abc")),
               &str,
               Utf8,
               StringArray
           );
   ```
   This will fail with a compile error from the regex subsystem.
   
   **Expected behavior**
   The regex_match function should accept "g" as the standard regex global expression flag.
   
   **Additional context**
   the regex_match function, that does behave as expected includes some lines to format flags into a rust pattern:
   https://github.com/apache/arrow-datafusion/blob/50a98805cdd6d5383f0c124d449ed549ca13428a/datafusion/src/physical_plan/regex_expressions.rs#L139
   
   This mapping is not present in the regex_match function. 


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