[jira] [Commented] (HIVE-12776) Add parse utility method for parsing any stand-alone HQL expression

["Alan Gates (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/HIVE-12776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15087759#comment-15087759 ] 

Alan Gates commented on HIVE-12776:
-----------------------------------

Here's an example of what I'm worried about.  A user is calling this interface with Hive 1.2, and getting back an AST that maybe looks like A->B->C.  In Hive 1.3 we make a language change, and the same syntax now produces a slightly different AST.  So after upgrading the user makes the same call with the same input and gets A->B->D->C.  I don't want to have to guarantee we won't cause these kinds of issues.  If we mark this clearly as not having backwards compatibility guarantees then I'm perfectly fine with it. 

> Add parse utility method for parsing any stand-alone HQL expression
> -------------------------------------------------------------------
>
>                 Key: HIVE-12776
>                 URL: https://issues.apache.org/jira/browse/HIVE-12776
>             Project: Hive
>          Issue Type: Improvement
>            Reporter: Rajat Khandelwal
>            Assignee: Rajat Khandelwal
>         Attachments: HIVE-12776.01.patch, HIVE-12776.02.patch
>
>
> Extensions that use Hive QL as their standard language, will benefit from this. 
> Apache Lens uses HQL as its language of choice. To support that, it depends on a fork of Hive, which has such code. I'm planning to port that to Apache Hive. 
> Relevant commit: https://github.com/InMobi/hive/commit/7caea9ed1d269c1cd1d1326cb39c1db7e0bf2bba#diff-fb3acd67881ceb02e83c2e42cf70beef



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