feat: add Firebird DB engine spec (#13353)

* feat: add Firebird DB engine spec

* Add dep to setup.py

* Fix lint

* Add tests

* Remove uneeded code

* Fix old bug

tests/db_engine_specs/firebird_tests.py

@@ -0,0 +1,81 @@
+# 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.
+from datetime import datetime
+from unittest import mock
+
+import pytest
+
+from superset.db_engine_specs.firebird import FirebirdEngineSpec
+
+grain_expressions = {
+    None: "timestamp_column",
+    "PT1S": (
+        "CAST(CAST(timestamp_column AS DATE) "
+        "|| ' ' "
+        "|| EXTRACT(HOUR FROM timestamp_column) "
+        "|| ':' "
+        "|| EXTRACT(MINUTE FROM timestamp_column) "
+        "|| ':' "
+        "|| FLOOR(EXTRACT(SECOND FROM timestamp_column)) AS TIMESTAMP)"
+    ),
+    "PT1M": (
+        "CAST(CAST(timestamp_column AS DATE) "
+        "|| ' ' "
+        "|| EXTRACT(HOUR FROM timestamp_column) "
+        "|| ':' "
+        "|| EXTRACT(MINUTE FROM timestamp_column) "
+        "|| ':00' AS TIMESTAMP)"
+    ),
+    "P1D": "CAST(timestamp_column AS DATE)",
+    "P1M": (
+        "CAST(EXTRACT(YEAR FROM timestamp_column) "
+        "|| '-' "
+        "|| EXTRACT(MONTH FROM timestamp_column) "
+        "|| '-01' AS DATE)"
+    ),
+    "P1Y": "CAST(EXTRACT(YEAR FROM timestamp_column) || '-01-01' AS DATE)",
+}
+
+
+@pytest.mark.parametrize("grain,expected", grain_expressions.items())
+def test_time_grain_expressions(grain, expected):
+    assert (
+        FirebirdEngineSpec._time_grain_expressions[grain].format(col="timestamp_column")
+        == expected
+    )
+
+
+def test_epoch_to_dttm():
+    assert (
+        FirebirdEngineSpec.epoch_to_dttm().format(col="timestamp_column")
+        == "DATEADD(second, timestamp_column, CAST('00:00:00' AS TIMESTAMP))"
+    )
+
+
+def test_convert_dttm():
+    dttm = datetime(2021, 1, 1)
+    assert (
+        FirebirdEngineSpec.convert_dttm("timestamp", dttm)
+        == "CAST('2021-01-01 00:00:00' AS TIMESTAMP)"
+    )
+    assert (
+        FirebirdEngineSpec.convert_dttm("TIMESTAMP", dttm)
+        == "CAST('2021-01-01 00:00:00' AS TIMESTAMP)"
+    )
+    assert FirebirdEngineSpec.convert_dttm("TIME", dttm) == "CAST('00:00:00' AS TIME)"
+    assert FirebirdEngineSpec.convert_dttm("DATE", dttm) == "CAST('2021-01-01' AS DATE)"
+    assert FirebirdEngineSpec.convert_dttm("STRING", dttm) is None