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Posted to dev@parquet.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2022/10/17 15:35:00 UTC
[jira] [Commented] (PARQUET-2161) Row positions are computed incorrectly when range or offset metadata filter is used
[ https://issues.apache.org/jira/browse/PARQUET-2161?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17618960#comment-17618960 ]
ASF GitHub Bot commented on PARQUET-2161:
-----------------------------------------
ala commented on PR #978:
URL: https://github.com/apache/parquet-mr/pull/978#issuecomment-1281067651
@ggershinsky @shangxinli Hi! I just wanted to ask if 1.12.4 release might be happening soon (it seems in the previous years there usually was a release around September-October time)? We could really use the fix in Spark. Also: do I need to cherry-pick this fix, or would the next release be cut from `master`?
> Row positions are computed incorrectly when range or offset metadata filter is used
> -----------------------------------------------------------------------------------
>
> Key: PARQUET-2161
> URL: https://issues.apache.org/jira/browse/PARQUET-2161
> Project: Parquet
> Issue Type: Bug
> Components: parquet-mr
> Affects Versions: 1.12.3
> Reporter: Ala Luszczak
> Priority: Major
>
> The row indexes introduced in PARQUET-2117 are not computed correctly when
> (1) range or offset metadata filter is applied, and
> (2) the first row group was eliminated by the filter
> For example, if a file has two row groups with 10 rows each, and we attempt to only read the 2nd row group, we are going to produce row indexes 0, 1, 2, ..., 9 instead of expected 10, 11, ..., 19.
> This happens because functions `filterFileMetaDataByStart` (used here: https://github.com/apache/parquet-mr/blob/e06384455567c56d5906fc3a152ab00fd8dfdf33/parquet-hadoop/src/main/java/org/apache/parquet/format/converter/ParquetMetadataConverter.java#L1453) and `filterFileMetaDataByMidpoint` (used here: https://github.com/apache/parquet-mr/blob/e06384455567c56d5906fc3a152ab00fd8dfdf33/parquet-hadoop/src/main/java/org/apache/parquet/format/converter/ParquetMetadataConverter.java#L1460) modify their input `FileMetaData`. To address the issue we need to `generateRowGroupOffsets` before these filters are applied.
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