Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/3764#discussion_r22196879
--- Diff: python/pyspark/sql.py ---
@@ -2085,6 +2085,35 @@ def subtract(self, other, numPartitions=None):
else:
raise ValueError("Can only subtract another SchemaRDD")
+ def sample(self, withReplacement, fraction, seed=None):
+ """
+ Return a sampled subset of this SchemaRDD.
+
+ >>> srdd = sqlCtx.inferSchema(rdd)
+ >>> srdd.sample(False, 0.5, 97).count()
+ 2L
+ """
+ assert fraction >= 0.0, "Negative fraction value: %s" % fraction
+ seed = seed if seed is not None else random.randint(0, sys.maxint)
+ rdd = self._jschema_rdd.baseSchemaRDD().sample(
--- End diff --
Could you add sample() for JavaSchemaRDD()? Then this line could be changed
to use self._jschema_rdd.sample()
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