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Posted to issues@spark.apache.org by "KaiXinXIaoLei (JIRA)" <ji...@apache.org> on 2018/02/23 01:27:00 UTC
[jira] [Reopened] (SPARK-23405) The task will hang up when a small
table left semi join a big table
[ https://issues.apache.org/jira/browse/SPARK-23405?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
KaiXinXIaoLei reopened SPARK-23405:
-----------------------------------
[~q79969786] In the left semi join, the left table will not broadcast. And there is many null value of 'cs_order_number' in the right table. I think the null value should be filter in the logical plan.
> The task will hang up when a small table left semi join a big table
> -------------------------------------------------------------------
>
> Key: SPARK-23405
> URL: https://issues.apache.org/jira/browse/SPARK-23405
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.1
> Reporter: KaiXinXIaoLei
> Priority: Major
> Attachments: SQL.png, taskhang up.png
>
>
> I run a sql: `select ls.cs_order_number from ls left semi join catalog_sales cs on ls.cs_order_number = cs.cs_order_number`, The `ls` table is a small table ,and the number is one. The `catalog_sales` table is a big table, and the number is 10 billion. The task will be hang up:
> !taskhang up.png!
> And the sql page is :
> !SQL.png!
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