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https://issues.apache.org/jira/browse/CALCITE-2741?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16722016#comment-16722016
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Lai Zhou commented on CALCITE-2741:
-----------------------------------

[~zabetak] , considering that:

someone wants to implement his OLAP queries on OLTP system, 

For example,we write a lot of hive sql to do a batch job, which extracting 
thousands of variables to train a machine-leanring model.

Now we want to extract the variables from a real-time datasource as input for 
the model. if we have a low-latency hive sql engine, it will save a plenty of 
time for developers.

In my company, we implement a low-latency hive sql engine based on calcite to 
achieve this goal,it worked out fine . 

> extend the native  enummerable implemention of calcite to support Hive SQL 
> ---------------------------------------------------------------------------
>
>                 Key: CALCITE-2741
>                 URL: https://issues.apache.org/jira/browse/CALCITE-2741
>             Project: Calcite
>          Issue Type: New Feature
>          Components: core
>            Reporter: Lai Zhou
>            Assignee: Julian Hyde
>            Priority: Minor
>
> [~julianhyde],
> I extended the native enummerable implemention of calcite to support Hive sql 
> ,include UDF、UDAF and all the SqlSpecialOperator,which inspired by apache 
> Drills.
> I modified the parser,type systems,and bridge the hive operator .
> How do you think of supporting a direct implemention of hive sql like this?
> I think it will be valueable when someone want to migrate his hive etl jobs 
> to real-time scene.



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