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https://issues.apache.org/jira/browse/SPARK-19655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15873110#comment-15873110
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hosein edited comment on SPARK-19655 at 2/18/17 11:11 AM:
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I connect to Vertica by JDBC and downloaded it's driver from this link:
https://my.vertica.com/download/vertica/client-drivers/
I supposed if I take JDBC driver jar file to Spark and define JDBC url in my
code, Spark works with this driver ...
was (Author: hosein_ey):
I connect to Vertica by JDBC and downloaded it's driver from this link:
https://my.vertica.com/download/vertica/client-drivers/
I supposed if I take Spark JDBC jar file and define JDBC url in it, Spark
works with this driver ...
> select count(*) , requests 1 for each row
> -----------------------------------------
>
> Key: SPARK-19655
> URL: https://issues.apache.org/jira/browse/SPARK-19655
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.0
> Reporter: hosein
> Priority: Minor
>
> when I want query select count( * ) by JDBC and monitor queries in database
> side, I see spark requests: select 1 for destination table
> it means 1 for each row and it is not optimized
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