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https://issues.apache.org/jira/browse/ARROW-12683?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated ARROW-12683:
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Labels: pull-request-available (was: )
> [C++] Enable fine-grained I/O (coalescing) in IPC reader
> --------------------------------------------------------
>
> Key: ARROW-12683
> URL: https://issues.apache.org/jira/browse/ARROW-12683
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: David Li
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> ARROW-11772 enables I/O coalescing in the IPC reader, but the reader operates
> at the granularity of an entire record batch; even if you're loading only a
> few columns, the entire record batch is read. When on a high-latency file
> system (e.g. S3), we may be able to get further performance improvement by
> traversing the schema and reading only the buffers we need to read. This can
> be combined with coalescing to reduce the number of I/O calls that need to be
> made.
> (Maybe there's another savings here in that instead of traversing the schema
> every time to figure out the buffer layout, we can do that only once up front
> and then reuse the layout subsequently?)
> While ArrayLoader already appears to perform this optimization, it's being
> handed an in-memory buffer in the first place, so no savings are accomplished.
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