add a comment in bin/spark-sql to remind user who wants to change the class

Author: SaintBacchus

bin/spark-sql

@@ -23,6 +23,7 @@
 # Enter posix mode for bash
 set -o posix
 
+# SparkSQLCLIDriver class name was used in SparkSubmit. Be careful about renaming it.
 CLASS="org.apache.spark.sql.hive.thriftserver.SparkSQLCLIDriver"
 
 # Figure out where Spark is installed

core/src/main/scala/org/apache/spark/deploy/SparkSubmit.scala

@@ -143,7 +143,7 @@ object SparkSubmit {
       case (_, CLUSTER) if isShell(args.primaryResource) =>
         printErrorAndExit("Cluster deploy mode is not applicable to Spark shells.")
       case (_, CLUSTER) if isSqlShell(args.mainClass) =>
-        printErrorAndExit("Cluster deploy mode is not applicable to Spark Sql shell.")
+        printErrorAndExit("Cluster deploy mode is not applicable to Spark SQL shell.")
       case _ =>
     }