[GitHub] [arrow] lidavidm commented on pull request #10520: ARROW-12709: [C++] Add binary_join_element_wise

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

lidavidm commented on pull request #10520:
URL: https://github.com/apache/arrow/pull/10520#issuecomment-861035926


   The null handling behavior never affects the separator: it only describes how to handle the other values. It's intended to let you mimic libcudf.
   
   ```
   binary_join_element_wise(['a', 'b', 'c', 'h'], ['d', null, 'e', 'i'], ['f', 'g', null, 'j'], [';', '-', ',', null])
   EMIT_NULL:                ['a', null, null, null]
   SKIP:                     ['a;d;f', 'b-g', 'c,e', null] # b and g are joined; the middle null value is ignored
   REPLACE(replacement=foo): ['a;d;f', 'b-foo-g', 'c,e,foo', null]
   ```


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