Ron Hu ecc179ecaa [SPARK-21322][SQL] support histogram in filter cardinality estimation ... ## What changes were proposed in this pull request? Histogram is effective in dealing with skewed distribution. After we generate histogram information for column statistics, we need to adjust filter estimation based on histogram data structure. ## How was this patch tested? We revised all the unit test cases by including histogram data structure. Please review http://spark.apache.org/contributing.html before opening a pull request. Author: Ron Hu <ron.hu@huawei.com> Closes #19783 from ron8hu/supportHistogram.		2017-12-12 15:04:49 +08:00
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src	[SPARK-21322][SQL] support histogram in filter cardinality estimation	2017-12-12 15:04:49 +08:00
pom.xml	[SPARK-22607][BUILD] Set large stack size consistently for tests to avoid StackOverflowError	2017-11-26 07:42:44 -06:00