[SQLLab] Fix, database api unlimited page size v2 (#8002)

* [database] Fix, Removes the limit for the page size, Bump FAB to 2.1.8

Old FAB API had no limits by default, this will keep this behaviour
but only for this endpoint

* [sqllab] Add test for database API

* [sqllab] Add test for database API

* [sqllab] Include page zero on request

* [sqllab] Fix, Black and requirements

* [sqllab] Make database API return unlimited results

* [sqllab] just a test

* [sqllab] Bump FAB to 2.1.9

* [sqllab] Remove unused import

tests/sqllab_tests.py

@@ -20,6 +20,7 @@ import json
 import unittest
 
 from flask_appbuilder.security.sqla import models as ab_models
+import prison
 
 from superset import db, security_manager
 from superset.dataframe import SupersetDataFrame
@@ -403,6 +404,23 @@ class SqlLabTests(SupersetTestCase):
 
         session.commit()
 
+    def test_api_database(self):
+        self.login("admin")
+
+        arguments = {
+            "keys": [],
+            "filters": [{"col": "expose_in_sqllab", "opr": "eq", "value": True}],
+            "order_column": "database_name",
+            "order_direction": "asc",
+            "page": 0,
+            "page_size": -1,
+        }
+        expected_results = ["examples", "fake_db_100", "main"]
+        url = "api/v1/database/?{}={}".format("q", prison.dumps(arguments))
+        data = self.get_json_resp(url)
+        for i, expected_result in enumerate(expected_results):
+            self.assertEquals(expected_result, data["result"][i]["database_name"])
+
 
 if __name__ == "__main__":
     unittest.main()