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[SPARK-16282][SQL] Implement percentile SQL function.
## What changes were proposed in this pull request? Implement percentile SQL function. It computes the exact percentile(s) of expr at pc with range in [0, 1]. ## How was this patch tested? Add a new testsuite `PercentileSuite` to test percentile directly. Updated related testcases in `ExpressionToSQLSuite`. Author: jiangxingbo <jiangxb1987@gmail.com> Author: 蒋星博 <jiangxingbo@meituan.com> Author: jiangxingbo <jiangxingbo@meituan.com> Closes #14136 from jiangxb1987/percentile.
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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/Percentile.scala 269 additions, 0 deletions...spark/sql/catalyst/expressions/aggregate/Percentile.scala
- sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/aggregate/PercentileSuite.scala 245 additions, 0 deletions.../sql/catalyst/expressions/aggregate/PercentileSuite.scala
- sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveSessionCatalog.scala 1 addition, 2 deletions.../scala/org/apache/spark/sql/hive/HiveSessionCatalog.scala
- sql/hive/src/test/scala/org/apache/spark/sql/catalyst/ExpressionToSQLSuite.scala 2 additions, 0 deletions.../org/apache/spark/sql/catalyst/ExpressionToSQLSuite.scala
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