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Posted to issues@spark.apache.org by "Wenchen Fan (Jira)" <ji...@apache.org> on 2019/10/15 04:44:00 UTC
[jira] [Assigned] (SPARK-29454) Reduce unsafeProjection call times
when read parquet file
[ https://issues.apache.org/jira/browse/SPARK-29454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan reassigned SPARK-29454:
-----------------------------------
Assignee: Yang Jie
> Reduce unsafeProjection call times when read parquet file
> ---------------------------------------------------------
>
> Key: SPARK-29454
> URL: https://issues.apache.org/jira/browse/SPARK-29454
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.3, 2.3.4, 2.4.4
> Reporter: Yang Jie
> Assignee: Yang Jie
> Priority: Major
>
> ParquetGroupConverter call unsafeProjection function to covert SpecificInternalRow to UnsafeRow every times when read Parquet data file use ParquetRecordReader, then ParquetFileFormat will call unsafeProjection function to covert this UnsafeRow to another UnsafeRow again when partitionSchema is not empty , and on the other hand PartitionReaderWithPartitionValues always do this convert process when use DataSourceV2.
> I think the first time convert in ParquetGroupConverter is redundant and ParquetRecordReader return a SpecificInternalRow is enough.
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