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[SPARK-9298][SQL] Add pearson correlation aggregation function
JIRA: https://issues.apache.org/jira/browse/SPARK-9298 This patch adds pearson correlation aggregation function based on `AggregateExpression2`. Author: Liang-Chi Hsieh <viirya@appier.com> Closes #8587 from viirya/corr_aggregation.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/FunctionRegistry.scala 1 addition, 0 deletions...apache/spark/sql/catalyst/analysis/FunctionRegistry.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/functions.scala 159 additions, 0 deletions.../spark/sql/catalyst/expressions/aggregate/functions.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/utils.scala 6 additions, 0 deletions...ache/spark/sql/catalyst/expressions/aggregate/utils.scala
- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala 18 additions, 0 deletions...rg/apache/spark/sql/catalyst/expressions/aggregates.scala
- sql/core/src/main/scala/org/apache/spark/sql/functions.scala 18 additions, 0 deletionssql/core/src/main/scala/org/apache/spark/sql/functions.scala
- sql/hive/compatibility/src/test/scala/org/apache/spark/sql/hive/execution/HiveCompatibilitySuite.scala 5 additions, 2 deletions...che/spark/sql/hive/execution/HiveCompatibilitySuite.scala
- sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/AggregationQuerySuite.scala 104 additions, 0 deletions...ache/spark/sql/hive/execution/AggregationQuerySuite.scala
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