msathis commented on issue #1890:
URL: 
https://github.com/apache/arrow-datafusion/issues/1890#issuecomment-1063886165


   Hi @andygrove, I did basic `coalesce` function in #1969. Right now i convert 
every argument to `string` and return a `string` from the function well. But I 
have a few doubts and need your help there :) 
   
   1. What data types do we need to support in `coalesce`? All primitive data 
types? If yes, can you please point me to a place where this is being done 
already which i can use it as a reference. 
   2. Can you please also point me to the TPC-DS benchmarks where `coalesce` is 
required? I did a quick search but couldn't find any.


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