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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-924) Extract LogicalPlan and PhysicalPlan classes from SemanticAnalysis class
Date Fri, 11 Dec 2009 22:48:18 GMT

    [ https://issues.apache.org/jira/browse/HIVE-924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12789588#action_12789588
] 

Zheng Shao commented on HIVE-924:
---------------------------------

SelectOperator contains a lot of transient variables. And selectDesc is a member variable
of SelectOperator right now.

I think OpDesc should have those descs, plus the children information. OpDesc should NOT have
the transient variables.

Is that good?



> Extract LogicalPlan and PhysicalPlan classes from SemanticAnalysis class
> ------------------------------------------------------------------------
>
>                 Key: HIVE-924
>                 URL: https://issues.apache.org/jira/browse/HIVE-924
>             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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