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https://issues.apache.org/jira/browse/PARQUET-1982?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17313163#comment-17313163
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ASF GitHub Bot commented on PARQUET-1982:
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fschmalzel commented on pull request #871:
URL: https://github.com/apache/parquet-mr/pull/871#issuecomment-811886333
First of sorry for the late answer.
We use parquet-data to display graphs. We needed the optimization to go back
pages if a user scrolls to the left or zooms out. I currently don't have any
concrete numbers but it was a lot more performant. Going from practically
unusably slow to reasonably fast, comparable to our legacy file format.
I plan to go and get some more precise numbers for our use case soon.
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> Allow random access to row groups in ParquetFileReader
> ------------------------------------------------------
>
> Key: PARQUET-1982
> URL: https://issues.apache.org/jira/browse/PARQUET-1982
> Project: Parquet
> Issue Type: New Feature
> Components: parquet-mr
> Reporter: Felix Schmalzel
> Priority: Minor
> Labels: parquetReader, random-access
>
> The used SeekableInputStream and all other components of the
> ParquetFileReader already support random access and row groups should be
> independent of each other.
> This would allow reusing the opened InputStream when you want to go back a
> row group. It also makes accessing specific row groups a lot easier.
> I've already developed a patch that would enable this functionality. I will
> link the merge request in the next few days.
> Is there a related ticket that i have overlooked?
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