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Posted to issues@hive.apache.org by "Colin Ma (JIRA)" <ji...@apache.org> on 2017/06/27 02:57:00 UTC
[jira] [Assigned] (HIVE-16969) Improvement performance of
MapOperator for Parquet
[ https://issues.apache.org/jira/browse/HIVE-16969?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Colin Ma reassigned HIVE-16969:
-------------------------------
> Improvement performance of MapOperator for Parquet
> --------------------------------------------------
>
> Key: HIVE-16969
> URL: https://issues.apache.org/jira/browse/HIVE-16969
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Colin Ma
> Assignee: Colin Ma
> Fix For: 3.0.0
>
>
> For a table with many partition files, MapOperator.cloneConfsForNestedColPruning() will update the hive.io.file.readNestedColumn.paths many times. The larger value of hive.io.file.readNestedColumn.paths will cause the poor performance for ParquetHiveSerDe.processRawPrunedPaths().
> So, the unnecessary paths should be appended to hive.io.file.readNestedColumn.paths.
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