GitHub user Jefffrey closed the discussion with a comment: How can I 
string-split a string field into a list field in Arrow Datafusion?

This is now possible with 
[`string_to_array`](https://datafusion.apache.org/user-guide/sql/scalar_functions.html#string-to-array)
 function

Equivalent DataFrame API: 
https://docs.rs/datafusion/latest/datafusion/functions_nested/expr_fn/fn.string_to_array.html

GitHub link: 
https://github.com/apache/datafusion/discussions/4605#discussioncomment-14990633

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