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From "Lefty Leverenz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HIVE-6013) Supporting Quoted Identifiers in Column Names
Date Sun, 26 Jan 2014 09:11:38 GMT

    [ https://issues.apache.org/jira/browse/HIVE-6013?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13882239#comment-13882239
] 

Lefty Leverenz commented on HIVE-6013:
--------------------------------------

This needs to be documented in various SELECT sections too.  If backticks are required when
hive.support.quoted.identifiers is set to 'column' then a lot of examples in Getting Started,
the Tutorial, Language Manual's Select and other Language Manual docs will need to be changed
(or rather, duplicated with a version note), for example:

* [Example Queries |https://cwiki.apache.org/confluence/display/Hive/GettingStarted#GettingStarted-ExampleQueries]
* [Querying and Inserting Data |https://cwiki.apache.org/confluence/display/Hive/Tutorial#Tutorial-QueryingandInsertingData]
* [Select |https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select]

Can wildcards/regex be used when hive.support.quoted.identifiers is 'column'?  Presumably
'SELECT * FROM table' is still valid.  Here's the current documentation:

* [REGEX Column Specification |https://cwiki.apache.org/confluence/display/Hive/LanguageManual+Select#LanguageManualSelect-REGEXColumnSpecification]

> Supporting Quoted Identifiers in Column Names
> ---------------------------------------------
>
>                 Key: HIVE-6013
>                 URL: https://issues.apache.org/jira/browse/HIVE-6013
>             Project: Hive
>          Issue Type: Improvement
>          Components: Query Processor
>            Reporter: Harish Butani
>            Assignee: Harish Butani
>             Fix For: 0.13.0
>
>         Attachments: HIVE-6013.1.patch, HIVE-6013.2.patch, HIVE-6013.3.patch, HIVE-6013.4.patch,
HIVE-6013.5.patch, HIVE-6013.6.patch, HIVE-6013.7.patch, QuotedIdentifier.html
>
>
> Hive's current behavior on Quoted Identifiers is different from the normal interpretation.
Quoted Identifier (using backticks) has a special interpretation for Select expressions(as
Regular Expressions). Have documented current behavior and proposed a solution in attached
doc.
> Summary of solution is:
> - Introduce 'standard' quoted identifiers for columns only. 
> - At the langauage level this is turned on by a flag.
> - At the metadata level we relax the constraint on column names.



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