paul-rogers opened a new pull request #2016: DRILL-7631: Updates to the Json 
Structure Parser
URL: https://github.com/apache/drill/pull/2016
 
 
   # [DRILL-7631](https://issues.apache.org/jira/browse/DRILL-7631): Updates to 
the Json Structure Parser
   
   ## Description
   
   The JSON structure parser converts JSON tokens from the Jackson JSON parser 
into a structure consisting of values, arrays and objects. The structure parser 
handles the JSON aspects. An associated set of listeners converts JSON values 
to some other format (such as to vectors via the column writers.) This PR 
covers only the structure parser.
   
   Work to create a new JSON record reader using this parser revealed several 
required revisions:
   
   * Convert the various typed listener creation calls in the listener to a 
generic call that takes a `ValueDef` value description.
   * Add support to replace listeners as is needed when starting with an 
"unknown" field, which later resolves to some type, such as `Integer`.
   * Reorganized the code to build sub-parsers based on incoming JSON structure.
   
   Note that, at present, no code uses the JSON structure parser. That code 
will come in a later PR.
   
   ## Documentation
   
   None
   
   ## Testing
   
   Expanded an reran the associated unit tests. Moved the unit tests so that 
they are in the same package as the code.
   

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