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https://issues.apache.org/jira/browse/SPARK-24959?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16756983#comment-16756983
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Apache Spark commented on SPARK-24959:
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User 'HyukjinKwon' has created a pull request for this issue:
https://github.com/apache/spark/pull/23708
> Do not invoke the CSV/JSON parser for empty schema
> --------------------------------------------------
>
> Key: SPARK-24959
> URL: https://issues.apache.org/jira/browse/SPARK-24959
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.1
> Reporter: Maxim Gekk
> Priority: Major
> Fix For: 2.4.0
>
>
> Currently JSON and CSV parsers are called even if required schema is empty.
> Invoking the parser per each line has some non-zero overhead. The action can
> be skipped. Such optimization should speed up count(), for example.
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