Add support for Cockroach DB (#9043)

* Add support for Cockroach DB

* Add documentation, fix installation and style for CockroachDB

* Fix formatting for black

docs/index.rst

@@ -110,6 +110,7 @@ The following RDBMS are currently supported:
 - `Apache Spark SQL <https://spark.apache.org/sql/>`_
 - `BigQuery <https://cloud.google.com/bigquery/>`_
 - `ClickHouse <https://clickhouse.yandex/>`_
+- `CockroachDB <https://www.cockroachlabs.com/>`_
 - `Dremio <https://dremio.com/>`_
 - `Elasticsearch <https://www.elastic.co/products/elasticsearch/>`_
 - `Exasol <https://www.exasol.com/>`_

docs/installation.rst

@@ -372,6 +372,8 @@ Here's a list of some of the recommended packages.
 +------------------+---------------------------------------+-------------------------------------------------+
 | ClickHouse       | ``pip install sqlalchemy-clickhouse`` |                                                 |
 +------------------+---------------------------------------+-------------------------------------------------+
+| CockroachDB      | ``pip install cockroachdb``           | ``cockroachdb://``                              |
++------------------+---------------------------------------+-------------------------------------------------+
 | Dremio           | ``pip install sqlalchemy_dremio``     | ``dremio://user:pwd@host:31010/``               |
 +------------------+---------------------------------------+-------------------------------------------------+
 | Elasticsearch    | ``pip install elasticsearch-dbapi``   | ``elasticsearch+http://``                       |

setup.py

@@ -119,6 +119,7 @@ setup(
         "druid": ["pydruid==0.5.7", "requests==2.22.0"],
         "hana": ["hdbcli==2.4.162", "sqlalchemy_hana==0.4.0"],
         "dremio": ["sqlalchemy_dremio>=0.5.0dev0"],
+        "cockroachdb": ["cockroachdb==0.3.3"],
     },
     python_requires="~=3.6",
     author="Apache Software Foundation",

superset/db_engine_specs/cockroachdb.py

@@ -0,0 +1,21 @@
+# 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 superset.db_engine_specs.postgres import PostgresEngineSpec
+
+
+class CockroachDbEngineSpec(PostgresEngineSpec):
+    engine = "cockroachdb"