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[SPARK-7241] Pearson correlation for DataFrames
submitting this PR from a phone, excuse the brevity. adds Pearson correlation to Dataframes, reusing the covariance calculation code cc mengxr rxin Author: Burak Yavuz <brkyvz@gmail.com> Closes #5858 from brkyvz/df-corr and squashes the following commits: 285b838 [Burak Yavuz] addressed comments v2.0 d10babb [Burak Yavuz] addressed comments v0.2 4b74b24 [Burak Yavuz] Merge branch 'master' of github.com:apache/spark into df-corr 4fe693b [Burak Yavuz] addressed comments v0.1 a682d06 [Burak Yavuz] ready for PR
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- python/pyspark/sql/dataframe.py 26 additions, 0 deletionspython/pyspark/sql/dataframe.py
- python/pyspark/sql/tests.py 6 additions, 0 deletionspython/pyspark/sql/tests.py
- sql/core/src/main/scala/org/apache/spark/sql/DataFrameStatFunctions.scala 26 additions, 0 deletions...n/scala/org/apache/spark/sql/DataFrameStatFunctions.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala 38 additions, 20 deletions...a/org/apache/spark/sql/execution/stat/StatFunctions.scala
- sql/core/src/test/java/test/org/apache/spark/sql/JavaDataFrameSuite.java 7 additions, 0 deletions...st/java/test/org/apache/spark/sql/JavaDataFrameSuite.java
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala 27 additions, 6 deletions.../test/scala/org/apache/spark/sql/DataFrameStatSuite.scala
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