[SPARK-7469] [SQL] DAG visualization: show SQL query operators

The DAG visualization currently displays only low-level Spark primitives (e.g. `map`, `reduceByKey`, `filter` etc.). For SQL, these aren't particularly useful. Instead, we should display higher level physical operators (e.g. `Filter`, `Exchange`, `ShuffleHashJoin`). cc marmbrus

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**Before**
<img src="https://issues.apache.org/jira/secure/attachment/12731586/before.png" width="600px"/>
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**After** (Pay attention to the words)
<img src="https://issues.apache.org/jira/secure/attachment/12731587/after.png" width="600px"/>
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Author: Andrew Or <andrew@databricks.com>

Closes #5999 from andrewor14/dag-viz-sql and squashes the following commits:

0db23a4 [Andrew Or] Merge branch 'master' of github.com:apache/spark into dag-viz-sql
1e211db [Andrew Or] Update comment
0d49fd6 [Andrew Or] Merge branch 'master' of github.com:apache/spark into dag-viz-sql
ffd237a [Andrew Or] Fix style
202dac1 [Andrew Or] Make ignoreParent false by default
e61b1ab [Andrew Or] Visualize SQL operators, not low-level Spark primitives
569034a [Andrew Or] Add a flag to ignore parent settings and scopes

3 files changed, 5 insertions, 3 deletions

diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScan.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScan.scala
index 0a5f19eee7..62dc4167b7 100644
--- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScan.scala
+++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/HiveTableScan.scala
@@ -129,7 +129,7 @@ case class HiveTableScan(
     }
   }
 
-  override def execute(): RDD[Row] = if (!relation.hiveQlTable.isPartitioned) {
+  protected override def doExecute(): RDD[Row] = if (!relation.hiveQlTable.isPartitioned) {
     hadoopReader.makeRDDForTable(relation.hiveQlTable)
   } else {
     hadoopReader.makeRDDForPartitionedTable(prunePartitions(relation.hiveQlPartitions))
diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala
index de8954d5de..c0b0b104e9 100644
--- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala
+++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/InsertIntoHiveTable.scala
@@ -258,5 +258,7 @@ case class InsertIntoHiveTable(
 
   override def executeCollect(): Array[Row] = sideEffectResult.toArray
 
-  override def execute(): RDD[Row] = sqlContext.sparkContext.parallelize(sideEffectResult, 1)
+  protected override def doExecute(): RDD[Row] = {
+    sqlContext.sparkContext.parallelize(sideEffectResult, 1)
+  }
 }
diff --git a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/ScriptTransformation.scala b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/ScriptTransformation.scala
index 3eddda3b28..bfd26e0170 100644
--- a/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/ScriptTransformation.scala
+++ b/sql/hive/src/main/scala/org/apache/spark/sql/hive/execution/ScriptTransformation.scala
@@ -54,7 +54,7 @@ case class ScriptTransformation(
 
   override def otherCopyArgs: Seq[HiveContext] = sc :: Nil
 
-  def execute(): RDD[Row] = {
+  protected override def doExecute(): RDD[Row] = {
     child.execute().mapPartitions { iter =>
       val cmd = List("/bin/bash", "-c", script)
       val builder = new ProcessBuilder(cmd)