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JIRA: https://issues.apache.org/jira/browse/SPARK-9297 Add two aggregation functions: covar_pop and covar_samp. Author: Liang-Chi Hsieh <viirya@gmail.com> Author: Liang-Chi Hsieh <viirya@appier.com> Closes #10029 from viirya/covar-funcs. |
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