[jira] [Commented] (HIVE-10120) Disallow create table with dot/colon in column name

["Lefty Leverenz (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-10120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14522834#comment-14522834 ] 

Lefty Leverenz commented on HIVE-10120:
---------------------------------------

Doc note:  See jira description.  These wiki pages need revision:

* [DDL -- Create Table (bullet after the syntax) | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-CreateTable]
* [DDL -- Rules for Column Names | https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL#LanguageManualDDL-RulesforColumnNames]

> Disallow create table with dot/colon in column name
> ---------------------------------------------------
>
>                 Key: HIVE-10120
>                 URL: https://issues.apache.org/jira/browse/HIVE-10120
>             Project: Hive
>          Issue Type: Improvement
>          Components: Parser
>            Reporter: Pengcheng Xiong
>            Assignee: Pengcheng Xiong
>              Labels: TODOC1.2
>             Fix For: 1.2.0
>
>         Attachments: HIVE-10120.01.patch, HIVE-10120.02.patch
>
>
> Since we don't allow users to query column names with dot in the middle such as emp.no, don't allow users to create tables with such columns that cannot be queried. Fix the documentation to reflect this fix.
> Here is an example. Consider this table:
> {code}
> CREATE TABLE a (`emp.no` string);
> select `emp.no` from a; fails with this message:
> FAILED: RuntimeException java.lang.RuntimeException: cannot find field emp from [0:emp.no]
> {code}
> The hive documentation needs to be fixed:
> {code}
>  (https://cwiki.apache.org/confluence/display/Hive/LanguageManual+DDL) seems to  indicate that any Unicode character can go between the backticks in the select statement, but it doesn’t like the dot/colon or even select * when there is a column that has a dot/colon. 
> {code}



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