Omega359 commented on issue #13552:
URL: https://github.com/apache/datafusion/issues/13552#issuecomment-2500960986
> > String functions MUST accept scalar values for all config arguments but
MAY accept both scalar and array if appropriate for the function.
>
> is a "config" argument well defined (I assume it means something like
`concat_ws(column, '**')` where the function mostly follows
Updated to add descriptions.
> > String functions SHOULD rely on type coercion to handle non-string data.
For example, concat('ab', 2, 'cc').
>
> This makes sense to me. I also did a little digging and found this:
>
>
https://github.com/apache/datafusion/blob/7553b3b5edeb45dfda891b3646e3b7ea3e07e790/datafusion/expr-common/src/signature.rs#L141-L145
>
> So maybe best practice would be that string functions used the
`Signature::String` or equivalent coercion rules
Updated.
> > String functions MAY choose to allow non-contiguous data types for data
arguments but it is NOT RECOMMENDED for functions with 3 or more arguments.
>
> It might make sense to define what "non-contiguous" means in this context
(does it mean having special implementations when there are multiple input
arguments that are not exactly the same type -- e.g. Utf8View and Utf8)?
Updated.
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