[SPARK-4860][pyspark][sql] speeding up `sample()` and `takeSample()`#3764

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jbencook wants to merge 5 commits intoapache:masterfrom

jbencook:master

Commits on Dec 22, 2014

[SPARK-4860][pyspark][sql] using Scala implementations of `sample()` and `takeSample()`
jbencook
committed

Commits on Dec 23, 2014

[SPARK-4860][pyspark][sql] adding sample() to JavaSchemaRDD
jbencook
committed
[SPARK-4860][pyspark][sql] using sample() method from JavaSchemaRDD
jbencook
committed
[SPARK-4860][pyspark][sql] fixing typo: from RDD to SchemaRDD
J. Benjamin Cook
committed
[SPARK-4860][pyspark][sql] fixing sloppy indentation for takeSampleToPython() arguments
J. Benjamin Cook
committed