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https://issues.apache.org/jira/browse/ARROW-17346?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kouhei Sutou updated ARROW-17346:
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Summary: [Java][Docs] Document the use of the batchSize argument in Dataset
ScanOptions (was: Document the use of the batchSize argument in Dataset
ScanOptions)
> [Java][Docs] Document the use of the batchSize argument in Dataset ScanOptions
> ------------------------------------------------------------------------------
>
> Key: ARROW-17346
> URL: https://issues.apache.org/jira/browse/ARROW-17346
> Project: Apache Arrow
> Issue Type: Improvement
> Components: Java
> Affects Versions: 9.0.0
> Reporter: Larry White
> Assignee: Larry White
> Priority: Major
>
> Several ScanOptions methods take a batchSize argument as shown:
> {{public ScanOptions(long batchSize) {}}
> {{ this(batchSize, Optional.empty());}}
> {{}}}
> Since the scanner reads one ArrowRecordBatch per load invocation, setting the
> parameter to a size larger than the RecordBatch has no effect. It only works
> when it's smaller than the number of rows in the RecordBatch, (i.e., the
> number or records read is equal to min(batchSize, recordBatch rowCount),
> potentially leading to some confusion.
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