apache/spark — pull request #1570 by chenghao-intel (2014-07-24 08:12:27+00:00)
Title: [SPARK-2665] [SQL] Add EqualNS & Unit Tests

Hive Supports the operator "<=>", which returns same result with EQUAL(=) operator for non-null operands, but returns TRUE if both are NULL, FALSE if one of the them is NULL.