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From "Zhenxiao Luo (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-1977) DESCRIBE TABLE syntax doesn't support specifying a database qualified table name
Date Mon, 09 Apr 2012 21:09:17 GMT

    [ https://issues.apache.org/jira/browse/HIVE-1977?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13250180#comment-13250180
] 

Zhenxiao Luo commented on HIVE-1977:
------------------------------------

currently the following is working:

1. $describe table;
2. $describe table.column;

while, these are not working:

3. $describe column;
4. $describe database.table;
5. $describe database.table.column;

always errors about the starting element is not a valid Table.

Hive should support #3 and #5, since these are standard syntax, by updating Hive.g and related
parser/lexer.

For #4, a new configuration property may be needed to distinguish #2 with #4.
Or, shall we always try matching both #2 and #4 when doing parsing? And error out if and only
if neither matches? In this way, no new configuration property needed.

This is also related to HIVE-2228.
                
> DESCRIBE TABLE syntax doesn't support specifying a database qualified table name
> --------------------------------------------------------------------------------
>
>                 Key: HIVE-1977
>                 URL: https://issues.apache.org/jira/browse/HIVE-1977
>             Project: Hive
>          Issue Type: Bug
>          Components: Database/Schema, Query Processor, SQL
>            Reporter: Carl Steinbach
>            Assignee: Zhenxiao Luo
>
> The syntax for DESCRIBE is broken. It should be:
> {code}
> DESCRIBE [EXTENDED] [database DOT]table [column]
> {code}
> but is actually
> {code}
> DESCRIBE [EXTENDED] table[DOT col_name]
> {code}
> Ref: http://dev.mysql.com/doc/refman/5.0/en/describe.html

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