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https://issues.apache.org/jira/browse/SPARK-21296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16073001#comment-16073001
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Apache Spark commented on SPARK-21296:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/18521
> Avoid per-record type dispatch in PySpark createDataFrame schema verification
> -----------------------------------------------------------------------------
>
> Key: SPARK-21296
> URL: https://issues.apache.org/jira/browse/SPARK-21296
> Project: Spark
> Issue Type: Improvement
> Components: PySpark
> Affects Versions: 2.2.0
> Reporter: Hyukjin Kwon
>
> Here, we do the type dispatch per record -
> https://github.com/apache/spark/blob/d935e0a9d9bb3d3c74e9529e161648caa50696b7/python/pyspark/sql/types.py#L1252-L1366
> and
> https://github.com/apache/spark/blob/d935e0a9d9bb3d3c74e9529e161648caa50696b7/python/pyspark/sql/session.py#L517-L537
> This requires per-record operation cost. We should get rid of this.
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