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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-4144) Add "select database()" command to show the current database
Date Mon, 21 Jul 2014 04:02:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-4144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14068174#comment-14068174
] 

Lefty Leverenz commented on HIVE-4144:
--------------------------------------

This is a function, so documentation will go in the UDF wiki.  If I understand correctly,
the function name is current_database() instead of database() as shown in the jira title.

In addition to the UDF doc, this can be mentioned in other places where USE db_name is discussed.
 Currently that would be the "Use Database" and "Create Table" sections of the DDL doc and
the Select doc.

Quick reference (docs not updated yet):

* [Operators and UDFs -- Misc. Functions (or separate section "Current Database Function")
| https://cwiki.apache.org/confluence/display/Hive/LanguageManual+UDF#LanguageManualUDF-Misc.Functions]
* [DDL -- Use Database | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-UseDatabase]
* [DDL -- Create Table | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTable]
* [Select -- Select Syntax | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select#LanguageManualSelect-SelectSyntax]

> Add "select database()" command to show the current database
> ------------------------------------------------------------
>
>                 Key: HIVE-4144
>                 URL: https://issues.apache.org/jira/browse/HIVE-4144
>             Project: Hive
>          Issue Type: Bug
>          Components: SQL
>            Reporter: Mark Grover
>            Assignee: Navis
>              Labels: TODOC13
>             Fix For: 0.13.0
>
>         Attachments: D9597.5.patch, HIVE-4144.10.patch.txt, HIVE-4144.11.patch.txt, HIVE-4144.12.patch.txt,
HIVE-4144.13.patch.txt, HIVE-4144.14.patch.txt, HIVE-4144.6.patch.txt, HIVE-4144.7.patch.txt,
HIVE-4144.8.patch.txt, HIVE-4144.9.patch.txt, HIVE-4144.D9597.1.patch, HIVE-4144.D9597.2.patch,
HIVE-4144.D9597.3.patch, HIVE-4144.D9597.4.patch
>
>
> A recent hive-user mailing list conversation asked about having a command to show the
current database.
> http://mail-archives.apache.org/mod_mbox/hive-user/201303.mbox/%3CCAMGr+0i+CRY69m3id=DxthmUCWLf0NxpKMCtROb=uauH2vAHng@mail.gmail.com%3E
> MySQL seems to have a command to do so:
> {code}
> select database();
> {code}
> http://dev.mysql.com/doc/refman/5.0/en/information-functions.html#function_database
> We should look into having something similar in Hive.



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