Github user liancheng commented on a diff in the pull request:
https://github.com/apache/spark/pull/5714#discussion_r30114601
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrame.scala ---
@@ -117,7 +117,7 @@ private[sql] object DataFrame {
@Experimental
class DataFrame private[sql](
@transient val sqlContext: SQLContext,
- @DeveloperApi @transient val queryExecution: SQLContext#QueryExecution)
+ @DeveloperApi @transient var queryExecution: SQLContext#QueryExecution)
--- End diff --
What I'm proposing is something like this:
```scala
class DataFrame private[sql](
@transient val sqlContext: SQLContext,
@DeveloperApi @transient private var _queryExecution:
SQLContext#QueryExecution)
extends RDDApi[Row] with Serializable {
...
@DeveloperApi def queryExecution: SQLContext#QueryExecution =
_queryExecution
...
}
```
In this way, we don't change the API (by adding a setter introduced by the
public `var`).
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