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Date: Wed, 8 Apr 2009 15:52:12 -0700 (PDT)
From: "Neil Conway (JIRA)" <jira@apache.org>
To: hive-dev@hadoop.apache.org
Subject: [jira] Commented: (HIVE-385) Split Driver.run() into compile() +
 exec()
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    [ https://issues.apache.org/jira/browse/HIVE-385?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12697274#action_12697274 ] 

Neil Conway commented on HIVE-385:
----------------------------------

Woops, silly mistake. I've attached a revisedion version with the Apache header. Thanks for the code review.

> Split Driver.run() into compile() + exec()
> ------------------------------------------
>
>                 Key: HIVE-385
>                 URL: https://issues.apache.org/jira/browse/HIVE-385
>             Project: Hadoop Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Neil Conway
>            Assignee: Neil Conway
>         Attachments: hive_driver_compile.patch, jira_385-1.patch, jira_385-2.patch
>
>
> Currently, Driver.run() parses, analyzes, and then executes a given query string. This isn't very flexible: it would be nice to be able to parse and analyze a query to get a query plan, and then execute that query plan at a later time (zero or more times). This would also be a necessary prerequisite for supporting server-side prepared statements.
> I'd like to change Driver as follows:
> * Add a new method Driver.compile(String), which parses and analyzes the given query string, and returns an object representing the planned query
> * Add a new method Driver.execute(Plan), which runs the given planned query
> * Reimplement run(String) as { p = compile(String); execute(p); }
> Comments welcome; I should have a candidate patch ready soon.

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