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https://issues.apache.org/jira/browse/IMPALA-8942?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16929451#comment-16929451
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Sahil Takiar commented on IMPALA-8942:
--------------------------------------

The fix for this is relatively simple, but testing with the current infra seems 
a bit tricky. Ideally, {{S3PlannerTest}} would work here, but it seems that 
class rotted since we don't run it on a regular basis.

The alternative is write a one-off unit tests using mocks, but it would be 
better if we used {{S3PlannerTest}}.

> Set file format specific values for split sizes on non-block stores
> -------------------------------------------------------------------
>
>                 Key: IMPALA-8942
>                 URL: https://issues.apache.org/jira/browse/IMPALA-8942
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Frontend
>            Reporter: Sahil Takiar
>            Assignee: Sahil Takiar
>            Priority: Major
>
> Parquet scans on non-block based storage systems (e.g. S3, ADLS, etc.) can 
> suffer from uneven scan range assignment due to the behavior described in 
> IMPALA-3453. The frontend should set different split sizes depending on the 
> file type and file system.



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