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https://issues.apache.org/jira/browse/PARQUET-520?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney reassigned PARQUET-520:
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Assignee: Wes McKinney
> Add support for zero-copy InputStreams on memory-mapped files
> -------------------------------------------------------------
>
> Key: PARQUET-520
> URL: https://issues.apache.org/jira/browse/PARQUET-520
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Wes McKinney
> Assignee: Wes McKinney
>
> Noted this while working on PARQUET-497. If we are using a memory-mapped
> file, then copying data into a {{ScopedInMemoryInputStream}} as we are now is
> unnecessary and will yield improved performance. Perhaps this should be made
> a property of the {{InputStream}} (i.e. indicate whether it support zero-copy
> reads, and the returned buffer does not become invalid after future reads as
> long as the stream -- the memory map specifically in this example -- is alive)
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