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[SPARK-17188][SQL] Moves class QuantileSummaries to project catalyst for...
[SPARK-17188][SQL] Moves class QuantileSummaries to project catalyst for implementing percentile_approx ## What changes were proposed in this pull request? This is a sub-task of [SPARK-16283](https://issues.apache.org/jira/browse/SPARK-16283) (Implement percentile_approx SQL function), which moves class QuantileSummaries to project catalyst so that it can be reused when implementing aggregation function `percentile_approx`. ## How was this patch tested? This PR only does class relocation, class implementation is not changed. Author: Sean Zhong <seanzhong@databricks.com> Closes #14754 from clockfly/move_QuantileSummaries_to_catalyst.
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- sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/QuantileSummaries.scala 264 additions, 0 deletions...rg/apache/spark/sql/catalyst/util/QuantileSummaries.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/util/QuantileSummariesSuite.scala 2 additions, 5 deletions...ache/spark/sql/catalyst/util/QuantileSummariesSuite.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala 1 addition, 246 deletions...a/org/apache/spark/sql/execution/stat/StatFunctions.scala
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