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From "John Muller (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-17536) Minor performance improvement to JDBC batch inserts
Date Wed, 14 Sep 2016 15:02:20 GMT
John Muller created SPARK-17536:
-----------------------------------

             Summary: 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


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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