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https://issues.apache.org/jira/browse/PARQUET-2323?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated PARQUET-2323:
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Labels: pull-request-available (was: )
> Use bit vector to store Prebuffered column chunk index
> ------------------------------------------------------
>
> Key: PARQUET-2323
> URL: https://issues.apache.org/jira/browse/PARQUET-2323
> Project: Parquet
> Issue Type: Improvement
> Components: parquet-cpp
> Reporter: Jinpeng Zhou
> Priority: Minor
> Labels: pull-request-available
> Fix For: cpp-13.0.0
>
> Time Spent: 10m
> Remaining Estimate: 0h
>
> In https://issues.apache.org/jira/browse/PARQUET-2316 we allow partial buffer
> in parquet File Reader by storing prebuffered column chunk index in a hash
> set, and make a copy of this hash set for each rowgroup reader
> In extreme conditions where numerous columns are prebuffered and multiple
> rowgroup readers are created for the same row group , the hash set would
> incur significant overhead.
> Using bit vector would be a reasonsable mitigation, taking 4KB for 32K
> columns.
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