jbencook fd41eb9574 [SPARK-4860][pyspark][sql] speeding up sample() and takeSample() ... This PR modifies the python `SchemaRDD` to use `sample()` and `takeSample()` from Scala instead of the slower python implementations from `rdd.py`. This is worthwhile because the `Row`'s are already serialized as Java objects. In order to use the faster `takeSample()`, a `takeSampleToPython()` method was implemented in `SchemaRDD.scala` following the pattern of `collectToPython()`. Author: jbencook <jbenjamincook@gmail.com> Author: J. Benjamin Cook <jbenjamincook@gmail.com> Closes #3764 from jbencook/master and squashes the following commits: 6fbc769 [J. Benjamin Cook] [SPARK-4860][pyspark][sql] fixing sloppy indentation for takeSampleToPython() arguments 5170da2 [J. Benjamin Cook] [SPARK-4860][pyspark][sql] fixing typo: from RDD to SchemaRDD de22f70 [jbencook] [SPARK-4860][pyspark][sql] using sample() method from JavaSchemaRDD b916442 [jbencook] [SPARK-4860][pyspark][sql] adding sample() to JavaSchemaRDD 020cbdf [jbencook] [SPARK-4860][pyspark][sql] using Scala implementations of `sample()` and `takeSample()`		2014-12-23 17:46:24 -08:00
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java/org/apache/spark/sql/api/java	[SPARK-4676][SQL] JavaSchemaRDD.schema may throw NullType MatchError if sql has null	2014-12-02 14:15:12 -08:00
scala/org/apache/spark/sql	[SPARK-4860][pyspark][sql] speeding up sample() and takeSample()	2014-12-23 17:46:24 -08:00