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[SPARK-7157][SQL] add sampleBy to DataFrame
Add `sampleBy` to DataFrame. rxin Author: Xiangrui Meng <meng@databricks.com> Closes apache#6769 from mengxr/SPARK-7157 and squashes the following commits: 991f26f [Xiangrui Meng] fix seed 4a14834 [Xiangrui Meng] move sampleBy to stat 832f7cc [Xiangrui Meng] add sampleBy to DataFrame
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