[jira] [Created] (CALCITE-3122) Contribution request: converting Pig Latin scripts into Calcite logical plan

["Khai Tran (JIRA)" <ji...@apache.org>]

Khai Tran created CALCITE-3122:
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             Summary: Contribution request: converting Pig Latin scripts into Calcite logical plan 
                 Key: CALCITE-3122
                 URL: https://issues.apache.org/jira/browse/CALCITE-3122
             Project: Calcite
          Issue Type: New Feature
          Components: core, piglet
            Reporter: Khai Tran


We create an internal Calcite repo at LinkedIn and develop APIs to parse any Pig Latin scripts into Calcite logical plan. The code was tested in nearly ~1000 Pig scripts written at LinkedIn.

Changes:
1. piglet: main conversion code live there, include:
 * APIs to convert any Pig scripts into RelNode plans or SQL statements
 * Use Pig Grunt parser to parse Pig Latin scripts into Pig logical plan (DAGs)
 * Convert Pig schemas into RelDatatype
 * Traverse through Pig expression plan and convert Pig expressions into RexNodes
 * Map some basic Pig UDFs to Calcite SQL operators
 * Build Calcite UDFs for any other Pig UDFs, including UDFs written in both Java and Python
 * Traverse (DFS) through Pig logical plans to convert each Pig logical nodes to RelNodes
 * Have an optimizer rule to optimize Pig group/cogroup into Aggregate operators

2. core:
 * Implement other RelNode in Rel2Sql so that Pig can be translated into SQL
 * Other minor changes in a few other classes to make Pig to Calcite works



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