Jefffrey commented on issue #880:
URL: https://github.com/apache/datafusion/issues/880#issuecomment-3314920081

   I'll close this as it's quite old and lots of things have changed since. For 
reference the mentioned functions should have a better signature now, see:
   
   - concat: `pub fn concat(args: Vec<Expr>) -> Expr`
     - 
https://docs.rs/datafusion/latest/datafusion/functions/expr_fn/fn.concat.html
   - regexp_match: `pub fn regexp_match(values: Expr, regex: Expr, flags: 
Option<Expr>) -> Expr`
     - 
https://docs.rs/datafusion/latest/datafusion/functions/expr_fn/fn.regexp_match.html
   - split_part: `pub fn split_part(string: Expr, delimiter: Expr, index: Expr) 
-> Expr`
     - 
https://docs.rs/datafusion/latest/datafusion/functions/expr_fn/fn.split_part.html


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