[SPARK-2986] [SQL] fixed: setting properties does not effect

it seems that set command does not run by SparkSQLDriver. it runs on hive api.
user can not change reduce number by setting spark.sql.shuffle.partitions

but i think setting hive properties seems just a role to spark sql.

Author: guowei <guowei@upyoo.com>

Closes #1904 from guowei2/temp-branch and squashes the following commits:

7d47dde [guowei] fixed: setting properties like spark.sql.shuffle.partitions does not effective

sql/hive-thriftserver/src/main/scala/org/apache/spark/sql/hive/thriftserver/SparkSQLCLIDriver.scala

@@ -34,7 +34,7 @@ import org.apache.hadoop.hive.common.{HiveInterruptCallback, HiveInterruptUtils,
 import org.apache.hadoop.hive.conf.HiveConf
 import org.apache.hadoop.hive.ql.Driver
 import org.apache.hadoop.hive.ql.exec.Utilities
-import org.apache.hadoop.hive.ql.processors.{CommandProcessor, CommandProcessorFactory}
+import org.apache.hadoop.hive.ql.processors.{SetProcessor, CommandProcessor, CommandProcessorFactory}
 import org.apache.hadoop.hive.ql.session.SessionState
 import org.apache.hadoop.hive.shims.ShimLoader
 import org.apache.thrift.transport.TSocket
@@ -284,7 +284,7 @@ private[hive] class SparkSQLCLIDriver extends CliDriver with Logging {
       val proc: CommandProcessor = CommandProcessorFactory.get(tokens(0), hconf)
 
       if (proc != null) {
-        if (proc.isInstanceOf[Driver]) {
+        if (proc.isInstanceOf[Driver] || proc.isInstanceOf[SetProcessor]) {
           val driver = new SparkSQLDriver
 
           driver.init()