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Posted to issues@spark.apache.org by "Wenchen Fan (JIRA)" <ji...@apache.org> on 2017/11/27 17:15:00 UTC
[jira] [Assigned] (SPARK-22529) Relation stats should be consistent
with other plans based on cbo config
[ https://issues.apache.org/jira/browse/SPARK-22529?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Wenchen Fan reassigned SPARK-22529:
-----------------------------------
Assignee: Zhenhua Wang
> Relation stats should be consistent with other plans based on cbo config
> ------------------------------------------------------------------------
>
> Key: SPARK-22529
> URL: https://issues.apache.org/jira/browse/SPARK-22529
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Zhenhua Wang
> Assignee: Zhenhua Wang
> Fix For: 2.3.0
>
>
> Currently, relation stats is the same whether cbo is enabled or not. While relation (`LogicalRelation` or `HiveTableRelation`) is a `LogicalPlan`, this behavior makes it inconsistent with other plans. This can cause confusion when user runs EXPLAIN COST commands. Besides, when CBO is disabled, we apply the size-only estimation strategy, so there's no need to propagate other statistics to relation.
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