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From "Ning Zhang (JIRA)" <>
Subject [jira] Commented: (HIVE-924) Extract LogicalPlan and PhysicalPlan classes from SemanticAnalysis class
Date Thu, 03 Dec 2009 19:57:20 GMT


Ning Zhang commented on HIVE-924:

Carl, I'm looking at the patch but I got some errors when applying to the latest revision.
Since this is quite a large patch and touches some files that are changed frequently. Can
you explain your design in more detail first and then update the patch with the latest revision?

> Extract LogicalPlan and PhysicalPlan classes from SemanticAnalysis class
> ------------------------------------------------------------------------
>                 Key: HIVE-924
>                 URL:
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Carl Steinbach
>         Attachments: HIVE-924.patch
> Currently the SemanticAnalyzer class handles semantic analysis, as well as logical plan
generation and physical plan generation. I think it would be beneficial to extract distinct
LogicalPlan and PhysicalPlan classes from the SemanticAnalyzer, and have the query processing
phase be coordinated by a QueryCompiler class that would be responsible for triggering the
parsing, semantic analysis, logical plan generation, optimization, and physical plan generation
phases. This proposed reorganization of components would help to isolate the state of each
phase, and would also bring the source into closer alignment with the description of the query
compiler in the Hive design document on the wiki.

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