Add RisingWave support (#6776)

Author: stefannegele

README.md

@@ -84,6 +84,7 @@ Redash supports more than 35 SQL and NoSQL [data sources](https://redash.io/help
 - Python
 - Qubole
 - Rockset
+- RisingWave
 - Salesforce
 - ScyllaDB
 - Shell Scripts

client/app/assets/images/db-logos/risingwave.png

@@ -0,0 +1,45 @@
+from redash.query_runner import register
+from redash.query_runner.pg import PostgreSQL
+
+
+class RisingWave(PostgreSQL):
+    @classmethod
+    def type(cls):
+        return "risingwave"
+
+    @classmethod
+    def name(cls):
+        return "RisingWave"
+
+    def _get_tables(self, schema):
+        query = """
+        SELECT s.nspname as table_schema,
+               c.relname as table_name,
+               a.attname as column_name,
+               null as data_type
+        FROM pg_class c
+        JOIN pg_namespace s
+        ON c.relnamespace = s.oid
+        AND s.nspname NOT IN ('pg_catalog', 'information_schema', 'rw_catalog')
+        JOIN pg_attribute a
+        ON a.attrelid = c.oid
+        AND a.attnum > 0
+        AND NOT a.attisdropped
+        WHERE c.relkind IN ('m', 'f', 'p')
+
+        UNION
+
+        SELECT table_schema,
+               table_name,
+               column_name,
+               data_type
+        FROM information_schema.columns
+        WHERE table_schema NOT IN ('pg_catalog', 'information_schema', 'rw_catalog');
+        """
+
+        self._get_definitions(schema, query)
+
+        return list(schema.values())
+
+
+register(RisingWave)

redash/query_runner/risingwave.py

@@ -339,6 +339,7 @@ def email_server_is_configured():
     "redash.query_runner.ignite",
     "redash.query_runner.oracle",
     "redash.query_runner.e6data",
+    "redash.query_runner.risingwave",
 ]
 
 enabled_query_runners = array_from_string(