apache/spark — pull request #893 by ueshin (2014-05-27 10:31:49+00:00)
Title: [SPARK-1938] [SQL] ApproxCountDistinctMergeFunction should return Int value.

`ApproxCountDistinctMergeFunction` should return `Int` value because the `dataType` of `ApproxCountDistinct` is `IntegerType`.