[jira] [Work logged] (HIVE-11741) Add a new hook to run before query parse/compile

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-11741?focusedWorklogId=446743&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-446743 ]

ASF GitHub Bot logged work on HIVE-11741:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 16/Jun/20 16:57
            Start Date: 16/Jun/20 16:57
    Worklog Time Spent: 10m 
      Work Description: github-actions[bot] commented on pull request #63:
URL: https://github.com/apache/hive/pull/63#issuecomment-644888564


   This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
   Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.


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Issue Time Tracking
-------------------

            Worklog Id:     (was: 446743)
    Remaining Estimate: 0h
            Time Spent: 10m

> Add a new hook to run before query parse/compile
> ------------------------------------------------
>
>                 Key: HIVE-11741
>                 URL: https://issues.apache.org/jira/browse/HIVE-11741
>             Project: Hive
>          Issue Type: New Feature
>          Components: Parser, SQL
>    Affects Versions: 1.2.1
>            Reporter: Guilherme Braccialli
>            Assignee: Guilherme Braccialli
>            Priority: Minor
>              Labels: patch
>         Attachments: HIVE-11741.patch
>
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> It would be nice to allow developers to extend hive query language, making possible to use custom wildcards on queries. 
> People uses Python or R to iterate over vectors or lists and create SQL commands, this could be implemented directly on sql syntax.
> For example this python script:
> >>> sql = "SELECT state, "
> >>> for i in range(10):
> ...   sql += "   sum(case when type = " + str(i) + " then value end) as sum_of_" + str(i) + " ,"
> ...
> >>> sql += " count(1) as  total FROM table"
> >>> print(sql)
> Could be written directly in extended sql like this:
> SELECT state,
> %for id = 1 to 10%
>    sum(case when type = %id% then value end) as sum_of_%id%,
> %end%
> , count(1) as total
> FROM table
> GROUP BY state
> This kind of extensibility can be easily added if we add a new hook after VariableSubstitution call on Driver.compile method.



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