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https://issues.apache.org/jira/browse/SPARK-20450?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15981750#comment-15981750
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Apache Spark commented on SPARK-20450:
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User 'ericl' has created a pull request for this issue:
https://github.com/apache/spark/pull/17749
> Unexpected first-query schema inference cost with 2.1.1 RC
> ----------------------------------------------------------
>
> Key: SPARK-20450
> URL: https://issues.apache.org/jira/browse/SPARK-20450
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.1.1
> Reporter: Eric Liang
>
> https://issues.apache.org/jira/browse/SPARK-19611 fixes a regression from 2.0
> where Spark silently fails to read case-sensitive fields missing a
> case-sensitive schema in the table properties. The fix is to detect this
> situation, infer the schema, and write the case-sensitive schema into the
> metastore.
> However this can incur an unexpected performance hit the first time such a
> problematic table is queried (and there is a high false-positive rate here
> since most tables don't actually have case-sensitive fields).
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