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https://issues.apache.org/jira/browse/SPARK-16434?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15367051#comment-15367051
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Apache Spark commented on SPARK-16434:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/14102
> Avoid record-per type dispatch in JSON when reading
> ---------------------------------------------------
>
> Key: SPARK-16434
> URL: https://issues.apache.org/jira/browse/SPARK-16434
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.0.0
> Reporter: Hyukjin Kwon
>
> Currently, {{JacksonParser.parse}} is doing type dispatch for each row to
> read appropriate values.
> It might not have to be done like this because the schema of {{DataFrame}} is
> already there.
> So, appropriate converters can be created first according to the schema, and
> then apply them to each row.
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