Xin Wu 040e46979d [SPARK-10747][SQL] Support NULLS FIRST|LAST clause in ORDER BY ... ## What changes were proposed in this pull request? Currently, ORDER BY clause returns nulls value according to sorting order (ASC|DESC), considering null value is always smaller than non-null values. However, SQL2003 standard support NULLS FIRST or NULLS LAST to allow users to specify whether null values should be returned first or last, regardless of sorting order (ASC|DESC). This PR is to support this new feature. ## How was this patch tested? New test cases are added to test NULLS FIRST|LAST for regular select queries and windowing queries. (If this patch involves UI changes, please attach a screenshot; otherwise, remove this) Author: Xin Wu <xinwu@us.ibm.com> Closes #14842 from xwu0226/SPARK-10747.		2016-09-14 21:14:29 +02:00
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antlr4/org/apache/spark/sql/catalyst/parser	[SPARK-10747][SQL] Support NULLS FIRST|LAST clause in ORDER BY	2016-09-14 21:14:29 +02:00
java/org/apache/spark/sql	[SPARK-17405] RowBasedKeyValueBatch should use default page size to prevent OOMs	2016-09-08 16:47:18 -07:00
scala/org/apache/spark/sql	[SPARK-10747][SQL] Support NULLS FIRST|LAST clause in ORDER BY	2016-09-14 21:14:29 +02:00