[jira] [Closed] (IMPALA-13307) disable_codegen_rows_threshold should apply to individual fragments

["Michael Smith (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IMPALA-13307?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Smith closed IMPALA-13307.
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    Resolution: Fixed

IMPALA-5443 isn't much more work, and supersedes any improvements here.

> disable_codegen_rows_threshold should apply to individual fragments
> -------------------------------------------------------------------
>
>                 Key: IMPALA-13307
>                 URL: https://issues.apache.org/jira/browse/IMPALA-13307
>             Project: IMPALA
>          Issue Type: Improvement
>          Components: Backend
>            Reporter: Michael Smith
>            Priority: Major
>              Labels: codegen
>
> The {{disable_codegen_rows_threshold}} is currently applied query-wide. So if a single scan deep in the query is expected to read a large number of rows, but everything else expects to see hundreds of rows because the results will be aggregated or heavily filtered, we still codegen the whole query.
> {{disable_codegen_rows_threshold}} should be evaluated for each fragment so we can determine whether to codegen based on the particular workload they'll be handling.



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