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Posted to issues@drill.apache.org by "Suresh Ollala (JIRA)" <ji...@apache.org> on 2016/07/25 20:55:20 UTC
[jira] [Updated] (DRILL-4743) HashJoin's not fully parallelized in
query plan
[ https://issues.apache.org/jira/browse/DRILL-4743?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Suresh Ollala updated DRILL-4743:
---------------------------------
Reviewer: Robert Hou
> HashJoin's not fully parallelized in query plan
> -----------------------------------------------
>
> Key: DRILL-4743
> URL: https://issues.apache.org/jira/browse/DRILL-4743
> Project: Apache Drill
> Issue Type: Bug
> Affects Versions: 1.5.0
> Reporter: Gautam Kumar Parai
> Assignee: Gautam Kumar Parai
> Labels: doc-impacting
> Fix For: 1.8.0
>
>
> The underlying problem is filter selectivity under-estimate for a query with complicated predicates e.g. deeply nested and/or predicates. This leads to under parallelization of the major fragment doing the join.
> To really resolve this problem we need table/column statistics to correctly estimate the selectivity. However, in the absence of statistics OR even when existing statistics are insufficient to get a correct estimate of selectivity this will serve as a workaround.
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