diff options
| -rw-r--r-- | sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala b/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala index 5cd0a18ff6..19cfa15f27 100644 --- a/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala +++ b/sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala @@ -952,10 +952,12 @@ class DataFrame private[sql]( ///////////////////////////////////////////////////////////////////////////// /** - * Returns the content of the [[DataFrame]] as an [[RDD]] of [[Row]]s. + * Represents the content of the [[DataFrame]] as an [[RDD]] of [[Row]]s. Note that the RDD is + * memoized. Once called, it won't change even if you change any query planning related Spark SQL + * configurations (e.g. `spark.sql.shuffle.partitions`). * @group rdd */ - def rdd: RDD[Row] = { + lazy val rdd: RDD[Row] = { // use a local variable to make sure the map closure doesn't capture the whole DataFrame val schema = this.schema queryExecution.executedPlan.execute().map(ScalaReflection.convertRowToScala(_, schema)) |