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https://issues.apache.org/jira/browse/SPARK-12509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15070190#comment-15070190
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Apache Spark commented on SPARK-12509:
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User 'NarineK' has created a pull request for this issue:
https://github.com/apache/spark/pull/10458
> Fix error messages for DataFrame correlation and covariance
> -----------------------------------------------------------
>
> Key: SPARK-12509
> URL: https://issues.apache.org/jira/browse/SPARK-12509
> Project: Spark
> Issue Type: Bug
> Components: Documentation, SQL
> Reporter: Narine Kokhlikyan
> Priority: Minor
>
> Currently, when we call corr or cov on dataframe with invalid input we see
> these error messages for both corr and cov:
> "Currently cov supports calculating the covariance between two
> columns"
> "Covariance calculation for columns with dataType "[DataType Name]" not
> supported."
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