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Posted to issues@spark.apache.org by "Yuming Wang (Jira)" <ji...@apache.org> on 2021/03/25 07:02:00 UTC
[jira] [Commented] (SPARK-34859) Vectorized parquet reader needs
synchronization among pages for column index
[ https://issues.apache.org/jira/browse/SPARK-34859?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17308435#comment-17308435 ]
Yuming Wang commented on SPARK-34859:
-------------------------------------
[~lxian2] Thank you for reporting this issue. Would you like work on this?
> Vectorized parquet reader needs synchronization among pages for column index
> ----------------------------------------------------------------------------
>
> Key: SPARK-34859
> URL: https://issues.apache.org/jira/browse/SPARK-34859
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 3.2.0
> Reporter: Li Xian
> Priority: Major
>
> the current implementation has a problem. the pages returned by `readNextFilteredRowGroup` may not be aligned, some columns may have more rows than others.
> Parquet is using `org.apache.parquet.column.impl.SynchronizingColumnReader` with `rowIndexes` to make sure that rows are aligned.
> Currently `VectorizedParquetRecordReader` doesn't have such synchronizing among pages from different columns. Using `readNextFilteredRowGroup` may result in incorrect result.
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