feat(ingest): define Redshift as a Postgres Source (#2540)

metadata-ingestion/README.md

@@ -43,6 +43,7 @@ We use a plugin architecture so that you can install only the dependencies you a
 | mysql         | `pip install 'acryl-datahub[mysql]'`                       | MySQL source               |
 | oracle        | `pip install 'acryl-datahub[oracle]'`                      | Oracle source              |
 | postgres      | `pip install 'acryl-datahub[postgres]'`                    | Postgres source            |
+| redshift      | `pip install 'acryl-datahub[redshift]'`                    | Redshift source            |
 | sqlalchemy    | `pip install 'acryl-datahub[sqlalchemy]'`                  | Generic SQLAlchemy source  |
 | snowflake     | `pip install 'acryl-datahub[snowflake]'`                   | Snowflake source           |
 | superset      | `pip install 'acryl-datahub[superset]'`                    | Supserset source           |
@@ -279,6 +280,26 @@ source:
     # options is same as above
 ```
 
+### Redshift `redshift`
+
+Extracts:
+
+- List of databases, schema, and tables
+- Column types associated with each table
+- Also supports PostGIS extensions
+
+```yml
+source:
+  type: redshift
+  config:
+    username: user
+    password: pass
+    host_port: localhost:5432
+    database: DemoDatabase
+    # table_pattern/schema_pattern is same as above
+    # options is same as above
+```
+
 ### Snowflake `snowflake`
 
 Extracts:

metadata-ingestion/setup.py

@@ -74,6 +74,7 @@ plugins: Dict[str, Set[str]] = {
     "mssql": sql_common | {"sqlalchemy-pytds>=0.3"},
     "mysql": sql_common | {"pymysql>=1.0.2"},
     "postgres": sql_common | {"psycopg2-binary", "GeoAlchemy2"},
+    "redshift": sql_common | {"psycopg2-binary", "GeoAlchemy2"},
     "snowflake": sql_common | {"snowflake-sqlalchemy"},
     "oracle": sql_common | {"cx_Oracle"},
     "ldap": {"python-ldap>=2.4"},
@@ -192,6 +193,7 @@ setuptools.setup(
             "mysql = datahub.ingestion.source.mysql:MySQLSource",
             "oracle = datahub.ingestion.source.oracle:OracleSource",
             "postgres = datahub.ingestion.source.postgres:PostgresSource",
+            "redshift = datahub.ingestion.source.redshift:RedshiftSource",
             "snowflake = datahub.ingestion.source.snowflake:SnowflakeSource",
             "superset = datahub.ingestion.source.superset:SupersetSource",
         ],

metadata-ingestion/src/datahub/ingestion/source/redshift.py

@@ -0,0 +1,7 @@
+from datahub.ingestion.source.postgres import PostgresSource
+from datahub.ingestion.source.sql_common import SQLAlchemySource
+
+
+class RedshiftSource(PostgresSource):
+    def __init__(self, config, ctx):
+        SQLAlchemySource.__init__(self, config, ctx, "redshift")