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https://issues.apache.org/jira/browse/DRILL-8088?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17468050#comment-17468050
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ASF GitHub Bot commented on DRILL-8088:
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luocooong commented on pull request #2412:
URL: https://github.com/apache/drill/pull/2412#issuecomment-1004154855
@paul-rogers Hello, thanks for the information. I just have a few questions
I'd like to know..
- **Code gen path** : Are you talking about the `Code Generation Workflow`?
If we are going to use the native java tools, is there anything we can do for
this?
- **Use provided-schema** : If we provide the schema at query time, does it
mean that we can also generate code once like Spark?
- **Refactors and changes** : Is there any reference old tickets were used
to rewrite and improve the CG path?
- **Vectorization** : As I understand, Drill only implements vector storage,
but had not implemented the vectorization base on these vector value, is that
correct?
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> Improve expression evaluation performance
> -----------------------------------------
>
> Key: DRILL-8088
> URL: https://issues.apache.org/jira/browse/DRILL-8088
> Project: Apache Drill
> Issue Type: Improvement
> Components: Execution - Codegen
> Reporter: wtf
> Assignee: wtf
> Priority: Minor
>
> Found unnecessary map copy when doing expression evaluation, it will slow
> down the codegen when the query include many "case when" or avg/stddev(the
> reduced expressions include "case when"). In our case, the query include 314
> avg, it takes 3+ seconds to generate the projector expressions(Intel(R)
> Xeon(R) CPU E5-2682 v4 @ 2.50GHz 32cores).
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