[SPARK-13456][SQL][FOLLOW-UP] lazily generate the outer pointer for case class defined in REPL

## What changes were proposed in this pull request?

In https://github.com/apache/spark/pull/11410, we missed a corner case: define the inner class and use it in `Dataset` at the same time by using paste mode. For this case, the inner class and the `Dataset` are inside same line object, when we build the `Dataset`, we try to get outer pointer from line object, and it will fail because the line object is not initialized yet.

https://issues.apache.org/jira/browse/SPARK-13456?focusedCommentId=15209174&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-15209174 is an example for this corner case.

This PR make the process of getting outer pointer from line object lazy, so that we can successfully build the `Dataset` and finish initializing the line object.

## How was this patch tested?

new test in repl suite.

Author: Wenchen Fan <wenchen@databricks.com>

Closes #11931 from cloud-fan/repl.

1 files changed, 15 insertions, 0 deletions

diff --git a/repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala b/repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala
index f148a6df47..dbfacba346 100644
--- a/repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala
+++ b/repl/scala-2.11/src/test/scala/org/apache/spark/repl/ReplSuite.scala
@@ -59,6 +59,10 @@ class ReplSuite extends SparkFunSuite {
     return out.toString
   }
 
+  // Simulate the paste mode in Scala REPL.
+  def runInterpreterInPasteMode(master: String, input: String): String =
+    runInterpreter(master, ":paste\n" + input + 4.toChar) // 4 is the ascii code of CTRL + D
+
   def assertContains(message: String, output: String) {
     val isContain = output.contains(message)
     assert(isContain,
@@ -381,4 +385,15 @@ class ReplSuite extends SparkFunSuite {
     assertDoesNotContain("error:", output)
     assertDoesNotContain("Exception", output)
   }
+
+  test("define case class and create Dataset together with paste mode") {
+    val output = runInterpreterInPasteMode("local-cluster[1,1,1024]",
+      """
+        |import sqlContext.implicits._
+        |case class TestClass(value: Int)
+        |Seq(TestClass(1)).toDS()
+      """.stripMargin)
+    assertDoesNotContain("error:", output)
+    assertDoesNotContain("Exception", output)
+  }
 }