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https://issues.apache.org/jira/browse/DRILL-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17216076#comment-17216076
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ASF GitHub Bot commented on DRILL-7763:
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cgivre commented on pull request #2092:
URL: https://github.com/apache/drill/pull/2092#issuecomment-711104163
@vvysotskyi I don't know if you're still looking at this or not, but I
refactored the code and it's now ready for review. I removed the
`applyLimit()` function from the `EasyGroupScan` and made some minor
modifications to the
[`AbstractGroupScanWithMetadata.applyLimit()`](https://github.com/apache/drill/blob/master/exec/java-exec/src/main/java/org/apache/drill/exec/physical/base/AbstractGroupScanWithMetadata.java#L453)
method so that it simply passes down the limit.
At this point it is up to each format plugin to actually do something with
it. This should not affect the pruning at all.
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> Add Limit Pushdown to File Based Storage Plugins
> ------------------------------------------------
>
> Key: DRILL-7763
> URL: https://issues.apache.org/jira/browse/DRILL-7763
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.17.0
> Reporter: Charles Givre
> Assignee: Charles Givre
> Priority: Major
> Fix For: 1.19.0
>
>
> As currently implemented, when querying a file, Drill will read the entire
> file even if a limit is specified in the query. This PR does a few things:
> # Refactors the EasyGroupScan, EasySubScan, and EasyFormatConfig to allow
> the option of pushing down limits.
> # Applies this to all the EVF based format plugins which are: LogRegex,
> PCAP, SPSS, Esri, Excel and Text (CSV).
> Due to JSON's fluid schema, it would be unwise to adopt the limit pushdown as
> it could result in very inconsistent schemata.
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