Repository: carbondata
Updated Branches:
  refs/heads/master 6026cb57c -> d3c907b71


[CARBONDATA-2563][CATALYST] Explain query with Order by operator is fired Spark 
Job
which is increase explain query time even though isQueryStatisticsEnabled is 
false

Even though isQueryStatisticsEnabled is false which means user doesnt wants to 
see
statistics for explain command, still the engine tries to fetch the paritions 
information
which causes a job execution in case of order by query, this is mainly because
spark engine does sampling for defifning certain range within paritions  for 
sorting process.

As part of solution the explain command process shall fetch the parition info 
only if isQueryStatisticsEnabled  true.

This closes #2974


Project: http://git-wip-us.apache.org/repos/asf/carbondata/repo
Commit: http://git-wip-us.apache.org/repos/asf/carbondata/commit/d3c907b7
Tree: http://git-wip-us.apache.org/repos/asf/carbondata/tree/d3c907b7
Diff: http://git-wip-us.apache.org/repos/asf/carbondata/diff/d3c907b7

Branch: refs/heads/master
Commit: d3c907b71a6dbc5fb9b2c0167959de7763d1032d
Parents: 6026cb5
Author: s71955 <[email protected]>
Authored: Tue Dec 4 20:48:55 2018 +0530
Committer: kumarvishal09 <[email protected]>
Committed: Thu Dec 13 11:14:31 2018 +0530

----------------------------------------------------------------------
 .../carbondata/core/profiler/ExplainCollector.java       |  6 +++++-
 .../execution/command/table/CarbonExplainCommand.scala   | 11 ++++++++---
 2 files changed, 13 insertions(+), 4 deletions(-)
----------------------------------------------------------------------


http://git-wip-us.apache.org/repos/asf/carbondata/blob/d3c907b7/core/src/main/java/org/apache/carbondata/core/profiler/ExplainCollector.java
----------------------------------------------------------------------
diff --git 
a/core/src/main/java/org/apache/carbondata/core/profiler/ExplainCollector.java 
b/core/src/main/java/org/apache/carbondata/core/profiler/ExplainCollector.java
index 8513dac..75568e4 100644
--- 
a/core/src/main/java/org/apache/carbondata/core/profiler/ExplainCollector.java
+++ 
b/core/src/main/java/org/apache/carbondata/core/profiler/ExplainCollector.java
@@ -171,7 +171,11 @@ public class ExplainCollector {
   }
 
   public static String getFormatedOutput() {
-    return get().toString();
+    if (null != get()) {
+      return get().toString();
+    } else {
+      return null;
+    }
   }
 
   @Override

http://git-wip-us.apache.org/repos/asf/carbondata/blob/d3c907b7/integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonExplainCommand.scala
----------------------------------------------------------------------
diff --git 
a/integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonExplainCommand.scala
 
b/integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonExplainCommand.scala
index 8939c6a..aa7a541 100644
--- 
a/integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonExplainCommand.scala
+++ 
b/integration/spark2/src/main/scala/org/apache/spark/sql/execution/command/table/CarbonExplainCommand.scala
@@ -47,12 +47,17 @@ case class CarbonExplainCommand(
   }
 
   private def collectProfiler(sparkSession: SparkSession): Seq[Row] = {
-    val queryExecution =
-      
sparkSession.sessionState.executePlan(child.asInstanceOf[ExplainCommand].logicalPlan)
     try {
       ExplainCollector.setup()
-      queryExecution.toRdd.partitions
       if (ExplainCollector.enabled()) {
+        val queryExecution =
+          
sparkSession.sessionState.executePlan(child.asInstanceOf[ExplainCommand].logicalPlan)
+        queryExecution.toRdd.partitions
+        // For count(*) queries the explain collector will be disabled, so 
profiler
+        // informations not required in such scenarios.
+        if (null == ExplainCollector.getFormatedOutput) {
+          Seq.empty
+        }
         Seq(Row("== CarbonData Profiler ==\n" + 
ExplainCollector.getFormatedOutput))
       } else {
         Seq.empty

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