Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4416#discussion_r24254634
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -114,6 +114,22 @@ trait DataFrame extends RDDApi[Row] {
/** Prints the schema to the console in a nice tree format. */
def printSchema(): Unit
+ /** Returns true if the [[DataFrame]] is created from a small, local
dataset. */
--- End diff --
Does this really mean `if collect() can be called without running a job`?
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