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

• Type: New Feature
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.4.0
• Component/s: Functions - Drill
• Assignee: DrillCommitter
• Reporter: Jinfeng Ni
• Created: 07/Jun/14 00:36
• Updated: 11/Jun/14 15:52
• Resolved: 11/Jun/14 15:52

Description

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;