Github user maropu commented on the issue:
https://github.com/apache/spark/pull/18144
Thanks for your work. But, I'm not 100% sure we need to make this signature
consistent with `array` and `struct`. IIUC we preferentially add these
functions in `FunctionRegistry` (users can use them via `selectExpr`) and do
not touch this file. cc: @gatorsmile @cloud-fan
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