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https://issues.apache.org/jira/browse/DRILL-7330?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17059458#comment-17059458
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ASF GitHub Bot commented on DRILL-7330:
---------------------------------------
paul-rogers commented on pull request #2026: DRILL-7330: Implement metadata
usage for all format plugins
URL: https://github.com/apache/drill/pull/2026#discussion_r392608927
##########
File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/scan/framework/ShimBatchReader.java
##########
@@ -131,6 +131,8 @@ public boolean next() {
eof = ! reader.next();
}
+ readerOrchestrator.setEof(eof);
Review comment:
Is there a need for this? The design is that EOF is indicated when:
* `open()` returns false. (As in an empty file with no schema. Think blank
CSV file.)
* `next()` returns false with no data. (Simple EOF.)
* `next()` returns false with data. EOF is on the next batch.
Eof handling logic is built into the `ScanOperatorExec` and, in particular,
the `ReaderState`. I worry about adding additional state that must be kept in
sync.
What is the intent here? Maybe I can help you find a solution that uses the
existing mechanisms.
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> Implement metadata usage for text format plugin
> -----------------------------------------------
>
> Key: DRILL-7330
> URL: https://issues.apache.org/jira/browse/DRILL-7330
> Project: Apache Drill
> Issue Type: Sub-task
> Reporter: Arina Ielchiieva
> Assignee: Vova Vysotskyi
> Priority: Major
> Fix For: 1.18.0
>
>
> 1. Change the current group scan to leverage Schema from Metastore;
> 2. Use stats for enabling additional logical planning rules for text format
> plugin. It will enable such optimizations as limit, filter push and so on.
> + add possibility to pass schema through schema file (using path or table
> root), inline.
> + check for other enhancements in analyze command
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