feat: welcome presto to the suite of tested databases (#10498)

* Add presto to the CI

Sample test data

Datetime conversion

Sample test data

Fix tests

* TODO to switch to timestamps

* Address feedback

* Update requirements

* Add TODOs

Co-authored-by: bogdan kyryliuk <bogdankyryliuk@dropbox.com>

tests/sqllab_test_util.py

@@ -0,0 +1,57 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+# isort:skip_file
+
+import pytest
+from sqlalchemy.engine import Engine
+
+from superset.utils.core import get_example_database
+from tests.test_app import app
+
+CTAS_SCHEMA_NAME = "sqllab_test_db"
+
+
+def drop_from_schema(engine: Engine, schema_name: str):
+    schemas = engine.execute(f"SHOW SCHEMAS").fetchall()
+    if schema_name not in [s[0] for s in schemas]:
+        # schema doesn't exist
+        return
+    tables = engine.execute(
+        f"SELECT table_name from information_schema.tables where table_schema = '{schema_name}'"
+    ).fetchall()
+    views = engine.execute(
+        f"SELECT table_name from information_schema.views where table_schema = '{schema_name}'"
+    ).fetchall()
+    for tv in tables + views:
+        engine.execute(f"DROP TABLE IF EXISTS {schema_name}.{tv[0]}")
+        engine.execute(f"DROP VIEW IF EXISTS {schema_name}.{tv[0]}")
+
+
+@pytest.fixture(scope="module", autouse=True)
+def setup_presto_if_needed():
+    with app.app_context():
+        examples_db = get_example_database()
+        if examples_db.backend == "presto":
+            engine = examples_db.get_sqla_engine()
+
+            drop_from_schema(engine, CTAS_SCHEMA_NAME)
+            engine.execute(f"DROP SCHEMA IF EXISTS {CTAS_SCHEMA_NAME}")
+            engine.execute(f"CREATE SCHEMA {CTAS_SCHEMA_NAME}")
+
+            drop_from_schema(engine, "admin_database")
+            engine.execute("DROP SCHEMA IF EXISTS admin_database")
+            engine.execute("CREATE SCHEMA admin_database")