[jira] [Created] (DRILL-927) Run-time code generation support when a function parameter is complex nested type.

["Jinfeng Ni (JIRA)" <ji...@apache.org>]

Jinfeng Ni created DRILL-927:
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             Summary: Run-time code generation support when a function parameter is complex nested type.
                 Key: DRILL-927
                 URL: https://issues.apache.org/jira/browse/DRILL-927
             Project: Apache Drill
          Issue Type: New Feature
            Reporter: Jinfeng Ni
            Assignee: Jinfeng Ni


In this JIRA, we will enhance the run-time code generation component, in the following ways:

1. Allow generate the run-time code for function whose parameter is FieldReader.  A parameter FieldReader could match an argument of Repeated List, Repeated Map, or an element in Repeated List/map, or any nested complex type.

2. In addition, FieldReader will also match any singular value, such as int, float4, varchar. 

With this support enabled,  one could implement a function with parameter FieldReader to match any simple or complex nested type.

As an example of how to leverage this new code generation logic, we add a new function "convert_toJson", which will convert any simple or complex type into a string in json format. 

    @Param FieldReader input;
    @Output VarBinaryHolder out;




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