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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-924) Extract LogicalPlan and PhysicalPlan classes from SemanticAnalysis class
Date Tue, 01 Dec 2009 18:00:21 GMT

    [ https://issues.apache.org/jira/browse/HIVE-924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12784310#action_12784310
] 

Ning Zhang commented on HIVE-924:
---------------------------------

Hi Carl,  sorry that we have not got enough cycles to review this patch in time. We will do
it soon.. Before doing that, there are some conflicts when applying this patch to the latest
revision. Can you update it to the latest revision? One general questions based on your description:
currently SemanticAnalyzer handles query, DML and DDL. Is there any reason that you only split
SemanticAnalyzer to DMLSemanticAnalyzer, not the other two?


> 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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