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[SPARK-19436][SQL] Add missing tests for approxQuantile
## What changes were proposed in this pull request? 1, check the behavior with illegal `quantiles` and `relativeError` 2, add tests for `relativeError` > 1 3, update tests for `null` data 4, update some docs for javadoc8 ## How was this patch tested? local test in spark-shell Author: Zheng RuiFeng <ruifengz@foxmail.com> Author: Ruifeng Zheng <ruifengz@foxmail.com> Closes #16776 from zhengruifeng/fix_approxQuantile.
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- sql/core/src/main/scala/org/apache/spark/sql/DataFrameStatFunctions.scala 17 additions, 13 deletions...n/scala/org/apache/spark/sql/DataFrameStatFunctions.scala
- sql/core/src/main/scala/org/apache/spark/sql/execution/stat/StatFunctions.scala 3 additions, 1 deletion...a/org/apache/spark/sql/execution/stat/StatFunctions.scala
- sql/core/src/test/scala/org/apache/spark/sql/DataFrameStatSuite.scala 68 additions, 9 deletions.../test/scala/org/apache/spark/sql/DataFrameStatSuite.scala
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