incorporating changes from review comments

Author: akhalymon

saphana-plugin/src/main/java/io/cdap/plugin/saphana/SapHanaConstants.java

@@ -24,8 +24,4 @@ public class SapHanaConstants {
   public static final String SAPHANA_CONNECTION_STRING_FORMAT = "jdbc:sap://%s:%s/";
   public static final String PLUGIN_NAME = "SapHana";
 
-  private SapHanaConstants() {
-    throw new AssertionError("Should not instantiate static utility class.");
-  }
-
 }

saphana-plugin/widgets/SapHana-action.json

@@ -1,6 +1,6 @@
 {
   "metadata": {
-    "spec-version": "1.0"
+    "spec-version": "1.6"
   },
   "display-name": "SAP HANA Execute",
   "configuration-groups": [
@@ -37,7 +37,7 @@
           "name": "database"
         },
         {
-          "widget-type": "textarea",
+          "widget-type": "sql-editor",
           "label": "Database Command",
           "name": "query"
         }

saphana-plugin/widgets/SapHana-batchsink.json

@@ -1,6 +1,6 @@
 {
   "metadata": {
-    "spec-version": "1.0"
+    "spec-version": "1.6"
   },
   "display-name": "SAP HANA",
   "configuration-groups": [

saphana-plugin/widgets/SapHana-batchsource.json

@@ -1,6 +1,6 @@
 {
   "metadata": {
-    "spec-version": "1.0"
+    "spec-version": "1.6"
   },
   "display-name": "SAP HANA",
   "configuration-groups": [
@@ -45,7 +45,7 @@
           "name": "database"
         },
         {
-          "widget-type": "textarea",
+          "widget-type": "sql-editor",
           "label": "Import Query",
           "name": "importQuery",
           "widget-attributes": {
@@ -81,12 +81,12 @@
           }
         },
         {
-          "widget-type": "textbox",
+          "widget-type": "input-field-selector",
           "label": "Split-By Field Name",
           "name": "splitBy"
         },
         {
-          "widget-type": "textbox",
+          "widget-type": "number",
           "label": "Number of Splits to Generate",
           "name": "numSplits",
           "widget-attributes": {

saphana-plugin/widgets/SapHana-postaction.json

@@ -1,6 +1,6 @@
 {
   "metadata": {
-    "spec-version": "1.0"
+    "spec-version": "1.6"
   },
   "configuration-groups": [
     {
@@ -49,7 +49,7 @@
           "name": "database"
         },
         {
-          "widget-type": "textarea",
+          "widget-type": "sql-editor",
           "label": "Query",
           "name": "query",
           "widget-attributes": {