[GitHub] [incubator-pinot] fx19880617 opened a new pull request #4216: PQL -> SQL enhancement - phase 1 - new Pinot Query Struct

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fx19880617 opened a new pull request #4216: PQL -> SQL enhancement - phase 1 - new Pinot Query Struct
URL: https://github.com/apache/incubator-pinot/pull/4216
 
 
   According to https://github.com/winedepot/pinot/issues/14, this PR will make PinotQuery the entry point for query processing.
   
   1. Created a new PinotQuery struct and set it inside BrokerRequest;
   2. Utils to convert from BrokerRequest to PinotQuery;
   3. AST Parser to generate PinotQuery from PQL directly
   4. Utils to convert from PinotQuery to BrokerRequest for back-compatibility;
   
   Before:
   PQL -> BrokerRequest-> Query Processing
   After:
   PQL -> PinotQuery -> BrokerRequest-> Query Processing
   

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