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https://issues.apache.org/jira/browse/KYLIN-4919?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoxiang Yu reassigned KYLIN-4919:
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Assignee: ShengJun Zheng
> Use NonShardingReadRDD/ShardingReadRdd automatically for different queries
> --------------------------------------------------------------------------
>
> Key: KYLIN-4919
> URL: https://issues.apache.org/jira/browse/KYLIN-4919
> Project: Kylin
> Issue Type: Improvement
> Reporter: ShengJun Zheng
> Assignee: ShengJun Zheng
> Priority: Major
>
> FilePruner will prune files in a segment cuboid dir by shard spec，then
> create a ShardingReadRdd by default (to optimize join performance).
> For queries without join, there is no need to create a shard RDD, it
> result in unnecessary empty spark tasks. It's better to create a
> NonShardingReadRDD after shard pruning.
> Suggest that KYLIN should decide to use NonShardingReadRDD or
> ShardingReadRdd automatically for different queries.
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