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https://issues.apache.org/jira/browse/SPARK-19655?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15873114#comment-15873114
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Sean Owen commented on SPARK-19655:
-----------------------------------
That's more the JDBC-Vertica integration than Spark-JDBC integration for
Vertica. It may not be relevant.
It could be a real problem then, if it's not fully pushing down the count, but
I guess I'd be surprised. I don't know that part of the code well enough and
don't see where it would generate a "select 1" either.
> 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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