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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:
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[~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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