Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/5279#discussion_r27488228
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -937,7 +937,10 @@ class DataFrame private[sql](
def 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))
+ queryExecution.executedPlan.execute().mapPartitions(rows => {
+ val converters = ScalaReflection.createConvertersForStruct(schema)
+ rows.map(ScalaReflection.convertRowToScalaWithConverters(_, schema,
converters))
+ })
--- End diff --
Similar to the `case` clause in pattern matching, we usually use
```scala
.mapPartitions { rows =>
...
}
```
or
```scala
.mapPartitions(rows => ...)
```
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