[PR] Add regexp extract function [datafusion]

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

Noughmad opened a new pull request, #17832:
URL: https://github.com/apache/datafusion/pull/17832

   Add a new function, `regexp_extract`, that works like the function of the same name in Spark. See https://spark.apache.org/docs/latest/api/python/reference/pyspark.sql/api/pyspark.sql.functions.regexp_extract.html . 
   
   ## Which issue does this PR close?
   
   This is a test assignment to demonstrate my proficiency with Rust, as well as how fast I could learn to work with a new codebase like DataFusion. 
   
   ## Rationale for this change
   
   The new function expands the functionality of DataFusion. 
   
   The code for the new function is largely copied from existing regex-related functions, namely `regexp_count` and `regexp_replace`. The `_count` function has more similar arguments, while the `_replace` has a more similar return value, so I combined the two. Copying from `regexp_match` and `regexp_like` was not useful because they are implemented in `arrow`, which does not have an equivalent `regexp_extract`. 
   
   Only the main functionality is really newly written, but that is a single-line function `extract_match_inner`. I also added another utility function to consolidate handling of different array types. 
   
   ## What changes are included in this PR?
   
   * A new scalar function called `regexp_extract`.
   
   ## Are these changes tested?
   
   * Yes, by single test case. Will definitely be expanded before submission. 
   
   ## Are there any user-facing changes?
   
   A new user-facing function has been added. It is documented, but I assume it also needs to be added to the changelog and user guide.. 


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Re: [PR] Add regexp extract function [datafusion]

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

Noughmad closed pull request #17832: Add regexp extract function
URL: https://github.com/apache/datafusion/pull/17832


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