Modify the ArrayType NULL value test

dtests/src/test/scala/io/snappydata/hydra/complexdatatypes/ArrayTypeNULLValue.scala

@@ -36,26 +36,46 @@ class ArrayTypeNULLValue extends SnappySQLJob {
     /**
       *  Test : NULL value in Complex Type column.
       */
+
+    /**
+      * Test Case 1 : ArrayType Column is last column in the table.
+      */
     snc.sql("create schema st")
     snc.sql("create table if not exists st.Student" +
       "(rollno int,name String, adminDate Array<Date>) using column")
     snc.sql("insert into st.Student select 1, 'ABC', null")
     snc.sql("insert into st.Student select 2,'XYZ',Array('2020-01-21')")
     val resultDF1 = snc.sql("select * from st.Student")
     val resultSet1 = resultDF1.collectAsList()
-    pw.println("ResultSet1 : ")
+    pw.println("ResultSet1 where ArrayType column is last : ")
     pw.println(resultSet1)
     snc.sql("drop table st.Student")
-    // Place the Array Type column in between some data types.
+
+    /**
+      *  Test Case 2 : ArrayType Column is between (say middle)  the other data types in the table.
+      */
     snc.sql("create table if not exists st.Student" +
       "(rollno int,adminDate Array<Date>,time TimeStamp, class int) using column")
     snc.sql("insert into st.Student select 1,Array('2020-01-21'), current_timestamp(),5")
     snc.sql("insert into st.Student select 1,null,null,6")
     val resultDF2 = snc.sql("select * from st.Student")
     val resultSet2 = resultDF2.collectAsList()
-    pw.println("ResultSet2 : ")
+    pw.println("ResultSet2 where ArrayType column is in middle : ")
     pw.println(resultSet2)
     snc.sql("drop table st.Student")
+
+    /**
+      *  Test Case 3: ArrayType Column is the first column in the table.
+     */
+    snc.sql("create table if not exists st.Student" +
+      "(Total Array<Double>,name String, rollno int) using column")
+    snc.sql("insert into st.Student select Array(25.6),'AAA',10")
+    snc.sql("insert into st.Student select null,'BBB',20")
+    val resultDF3 = snc.sql("select * from st.Student")
+    val resultSet3 = resultDF3.collectAsList()
+    pw.println("ResultSet3 where ArrayType column is First :")
+    pw.println(resultSet3)
+    snc.sql("drop table st.Student")
     snc.sql("drop schema st")
     pw.println("Inserting NULL value in ArrayType column  check OK")
     pw.flush()