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https://issues.apache.org/jira/browse/SPARK-17536?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-17536.
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Resolution: Fixed
Fix Version/s: 2.1.0
Issue resolved by pull request 15098
[https://github.com/apache/spark/pull/15098]
> Minor performance improvement to JDBC batch inserts
> ---------------------------------------------------
>
> Key: SPARK-17536
> URL: https://issues.apache.org/jira/browse/SPARK-17536
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: John Muller
> Priority: Trivial
> Labels: perfomance
> Fix For: 2.1.0
>
> Original Estimate: 0.5h
> Remaining Estimate: 0.5h
>
> JDBC batch inserts currently are set to repeatedly retrieve the number of
> fields inside the row iterator:
> https://github.com/apache/spark/blob/master/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/jdbc/JdbcUtils.scala#L598
> val numFields = rddSchema.fields.length
> This value does not change and can be set prior to the loop.
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