[SPARK-16383][SQL] Remove `SessionState.executeSql`

## What changes were proposed in this pull request?

This PR removes `SessionState.executeSql` in favor of `SparkSession.sql`. We can remove this safely since the visibility `SessionState` is `private[sql]` and `executeSql` is only used in one **ignored** test, `test("Multiple Hive Instances")`.

## How was this patch tested?

Pass the Jenkins tests.

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #14055 from dongjoon-hyun/SPARK-16383.

1 files changed, 3 insertions, 3 deletions

diff --git a/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/ConcurrentHiveSuite.scala b/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/ConcurrentHiveSuite.scala
index 1583a448ef..07d8c5bacb 100644
--- a/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/ConcurrentHiveSuite.scala
+++ b/sql/hive/src/test/scala/org/apache/spark/sql/hive/execution/ConcurrentHiveSuite.scala
@@ -30,9 +30,9 @@ class ConcurrentHiveSuite extends SparkFunSuite with BeforeAndAfterAll {
         conf.set("spark.ui.enabled", "false")
         val ts =
           new TestHiveContext(new SparkContext("local", s"TestSQLContext$i", conf))
-        ts.sessionState.executeSql("SHOW TABLES").toRdd.collect()
-        ts.sessionState.executeSql("SELECT * FROM src").toRdd.collect()
-        ts.sessionState.executeSql("SHOW TABLES").toRdd.collect()
+        ts.sparkSession.sql("SHOW TABLES").collect()
+        ts.sparkSession.sql("SELECT * FROM src").collect()
+        ts.sparkSession.sql("SHOW TABLES").collect()
       }
     }
   }