[jira] [Commented] (DRILL-5290) Provide an option to build operator table once for built-in static functions and reuse it across queries.

["Julian Hyde (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/DRILL-5290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15879088#comment-15879088 ] 

Julian Hyde commented on DRILL-5290:
------------------------------------

This is a good idea. Just to clarify, the "static" functions don't need to be static fields in the java class. They could be non-static if you choose, as long as you re-use the same operator table instance. Calcite's operator table API gives you several ways to build and combine operator tables, and reflection of (static) fields is not the only way. 

> Provide an option to build operator table once for built-in static functions and reuse it across queries.
> ---------------------------------------------------------------------------------------------------------
>
>                 Key: DRILL-5290
>                 URL: https://issues.apache.org/jira/browse/DRILL-5290
>             Project: Apache Drill
>          Issue Type: Bug
>    Affects Versions: 1.9.0
>            Reporter: Padma Penumarthy
>            Assignee: Padma Penumarthy
>             Fix For: 1.10
>
>
> Currently, DrillOperatorTable which contains standard SQL operators and functions and Drill User Defined Functions (UDFs) (built-in and dynamic) gets built for each query as part of creating QueryContext. This is an expensive operation ( ~30 msec to build) and allocates  ~2M on heap for each query. For high throughput, concurrent low latency operational queries, we quickly run out of heap memory, causing JVM hangs. Build operator table once during startup for static built-in functions and save in DrillbitContext, so we can reuse it across queries.
> Provide an system/session option to not use dynamic UDFs so we can use the operator table saved in DrillbitContext and avoid building each time.



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