1) Fix an error while retrieving json data from the table. Fixes #4427

2) Fix an issue where Explain and Explain Analyze are not working, it's regression of #1760. Fixes #4484
3) Fix an issue where Filter toolbar button is not working in view/edit data, it's regression of keyboard navigation. Fixes #4485

web/pgadmin/tools/sqleditor/tests/test_save_changed_data.py

@@ -251,7 +251,7 @@ class TestSaveChangedData(BaseTestGenerator):
             },
             save_status=True,
             check_sql='SELECT * FROM %s WHERE pk_col = 2',
-            check_result='SELECT 0'
+            check_result=None
         )),
     ]
 

web/pgadmin/tools/sqleditor/tests/test_view_data.py

@@ -0,0 +1,98 @@
+##########################################################################
+#
+# pgAdmin 4 - PostgreSQL Tools
+#
+# Copyright (C) 2013 - 2019, The pgAdmin Development Team
+# This software is released under the PostgreSQL Licence
+#
+##########################################################################
+
+import uuid
+import json
+import random
+
+from pgadmin.utils.route import BaseTestGenerator
+from pgadmin.browser.server_groups.servers.databases.tests import utils as \
+    database_utils
+from regression import parent_node_dict
+from regression.python_test_utils import test_utils
+from pgadmin.utils import server_utils, IS_PY2
+
+
+class TestViewData(BaseTestGenerator):
+    """
+    This class checks the view data result for a table with JSON datatype
+    """
+    skip_on_database = ['gpdb']
+    scenarios = [
+        (
+            'Table with JSON datatype',
+            dict(
+                table_sql="""Create Table <TABLE_NAME>(
+                id integer Not Null,
+                json_val json Not Null,
+                Constraint table_pk Primary Key(id)
+                );""",
+                result_data=None,
+                rows_fetched_to=0
+            )
+        )
+    ]
+
+    def setUp(self):
+        self.server_id = self.server_information['server_id']
+        self.database_info = parent_node_dict["database"][-1]
+        self.db_name = self.database_info["db_name"]
+        self.db_id = self.database_info["db_id"]
+
+        self.connection = test_utils.get_db_connection(
+            self.db_name,
+            self.server['username'],
+            self.server['db_password'],
+            self.server['host'],
+            self.server['port']
+        )
+
+    def runTest(self):
+        self.table = "test_table_%s" % (str(uuid.uuid4())[1:8])
+        self.table_sql = self.table_sql.replace('<TABLE_NAME>', self.table)
+        # Create table
+        test_utils.create_table_with_query(self.server,
+                                           self.db_name,
+                                           self.table_sql)
+
+        # Fetch Table OID
+        pg_cursor = self.connection.cursor()
+        pg_cursor.execute("""Select oid FROM pg_class WHERE
+         relname = '%s' AND relkind IN ('r','s','t')""" % self.table)
+
+        result = pg_cursor.fetchall()
+        table_id = result[0][0]
+
+        # Initialize query tool
+        url = '/datagrid/initialize/datagrid/3/table/{0}/{1}/{2}/{3}'.format(
+            test_utils.SERVER_GROUP, self.server_id, self.db_id, table_id)
+        response = self.tester.post(url)
+
+        self.assertEquals(response.status_code, 200)
+
+        response_data = json.loads(response.data.decode('utf-8'))
+        self.trans_id = response_data['data']['gridTransId']
+
+        url = "/sqleditor/view_data/start/{0}".format(self.trans_id)
+        response = self.tester.get(url)
+        self.assertEquals(response.status_code, 200)
+
+        # Check the query result
+        url = '/sqleditor/poll/{0}'.format(self.trans_id)
+        response = self.tester.get(url)
+        self.assertEquals(response.status_code, 200)
+        response_data = json.loads(response.data.decode('utf-8'))
+
+        self.assertEquals(response_data['data']['result'], self.result_data)
+        self.assertEquals(response_data['data']['rows_fetched_to'],
+                          self.rows_fetched_to)
+
+    def tearDown(self):
+        database_utils.disconnect_database(self, self.server_id,
+                                           self.db_id)