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https://issues.apache.org/jira/browse/DRILL-7763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17150727#comment-17150727
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ASF GitHub Bot commented on DRILL-7763:
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cgivre opened a new pull request #2092:
URL: https://github.com/apache/drill/pull/2092
# [DRILL-7763](https://issues.apache.org/jira/browse/DRILL-7763): Add Limit
Pushdown to File Based Storage Plugins
## Description
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.
## Documentation
No user visible changes. Queries with limits on large files are
considerably faster.
## Testing
All existing unit tests are run.
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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: 1.18.0
>
>
> 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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