siddharthteotia edited a comment on pull request #6728:
URL: https://github.com/apache/incubator-pinot/pull/6728#issuecomment-810954992


   High level question - can we consider merging these different specifications 
of data types. The DataType captured in the schema has both SV and MV for 
primitives so why can't we use that all the way even in functions.
   
   Also, not necessarily related to this PR but I don't think I fully 
understand the purpose of PinotDataType. It is currently used in record 
transformer and functions. For functions only in scalar transform functions and 
ingest transform functions for type conversion. Why do we need to convert the 
types between parameter type and argument type?
   
   For example, if we have foo (long 123), then parameterType is long and 
argument type is int ? Why do we need to convert ?
   
   The only place where we should convert is for cast functions but there we 
don't even use PinotDataType
   
   I feel a lot of type related code in FunctionInvoker and FunctionUtils can 
be cleaned up if we have a unified type throughout the engine. 


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