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From "Ning Zhang (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HIVE-31) Hive: support CREATE TABLE xxx SELECT yyy.* FROM yyy
Date Tue, 29 Sep 2009 23:58:32 GMT

    [ https://issues.apache.org/jira/browse/HIVE-31?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12760775#action_12760775
] 

Ning Zhang commented on HIVE-31:
--------------------------------

Chatted with Prasad offline. The decision to move the task of DDLSemanticAnalyzer to SemanticAnalyzer
is to have a single SemanticAnalyzer instance for the whole CTAS statement (otherwise, a SemanticsAnalyzer
is needed for the SELECT part to get the resulting schema, and a DDLSemanticAnalyzer for the
CREATE TABLE part). With one instance of SA, all info is shared and don't need to pass around.


Another issue Prasad raised is that the DDLWork is chained as the root task, and that should
be moved to the end of the task chain. I will change that in the next revision. 

> Hive: support CREATE TABLE xxx SELECT yyy.* FROM yyy
> ----------------------------------------------------
>
>                 Key: HIVE-31
>                 URL: https://issues.apache.org/jira/browse/HIVE-31
>             Project: Hadoop Hive
>          Issue Type: Bug
>          Components: Query Processor
>            Reporter: Zheng Shao
>            Assignee: Ning Zhang
>         Attachments: HIVE-31.patch
>
>
> We should allow users to create a table using query result, without specifying the column
names and column types.

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