Add server side parameters to session connection method (#823)

* Pass existing server_side_parameters to session connection wrapper and use to configure SparkSession.

* Incorporating feedback. Moved server side parameters to Connection and pass to cursor from there.

* Add changie

* Add type hint

* Write out loop

* Add type hint

* Remove server_side_parameters from connection wrapper

* Add handle type hint

* Make server_side_parameters optional

---------

Co-authored-by: Anthony LaRocca <alarocca@apixio.com>
Co-authored-by: Mike Alfare <13974384+mikealfare@users.noreply.github.com>

.changes/unreleased/Features-20230707-104150.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: Support server_side_parameters for Spark session connection method
+time: 2023-07-07T10:41:50.01541+02:00
+custom:
+  Author: alarocca-apixio
+  Issue: "690"

dbt/adapters/spark/connections.py

@@ -350,6 +350,7 @@ def open(cls, connection: Connection) -> Connection:
 
         creds = connection.credentials
         exc = None
+        handle: Any
 
         for i in range(1 + creds.connect_retries):
             try:
@@ -460,7 +461,9 @@ def open(cls, connection: Connection) -> Connection:
                         SessionConnectionWrapper,
                     )
 
-                    handle = SessionConnectionWrapper(Connection())  # type: ignore
+                    handle = SessionConnectionWrapper(
+                        Connection(server_side_parameters=creds.server_side_parameters)
+                    )
                 else:
                     raise dbt.exceptions.DbtProfileError(
                         f"invalid credential method: {creds.method}"

dbt/adapters/spark/session.py

@@ -4,7 +4,7 @@
 
 import datetime as dt
 from types import TracebackType
-from typing import Any, List, Optional, Tuple, Union
+from typing import Any, Dict, List, Optional, Tuple, Union
 
 from dbt.events import AdapterLogger
 from dbt.utils import DECIMALS
@@ -24,9 +24,10 @@ class Cursor:
     https://github.com/mkleehammer/pyodbc/wiki/Cursor
     """
 
-    def __init__(self) -> None:
+    def __init__(self, *, server_side_parameters: Optional[Dict[str, Any]] = None) -> None:
         self._df: Optional[DataFrame] = None
         self._rows: Optional[List[Row]] = None
+        self.server_side_parameters = server_side_parameters or {}
 
     def __enter__(self) -> Cursor:
         return self
@@ -106,7 +107,12 @@ def execute(self, sql: str, *parameters: Any) -> None:
         """
         if len(parameters) > 0:
             sql = sql % parameters
-        spark_session = SparkSession.builder.enableHiveSupport().getOrCreate()
+        builder = SparkSession.builder.enableHiveSupport()
+
+        for parameter, value in self.server_side_parameters.items():
+            builder = builder.config(parameter, value)
+
+        spark_session = builder.getOrCreate()
         self._df = spark_session.sql(sql)
 
     def fetchall(self) -> Optional[List[Row]]:
@@ -159,6 +165,9 @@ class Connection:
     https://github.com/mkleehammer/pyodbc/wiki/Connection
     """
 
+    def __init__(self, *, server_side_parameters: Optional[Dict[Any, str]] = None) -> None:
+        self.server_side_parameters = server_side_parameters or {}
+
     def cursor(self) -> Cursor:
         """
         Get a cursor.
@@ -168,7 +177,7 @@ def cursor(self) -> Cursor:
         out : Cursor
             The cursor.
         """
-        return Cursor()
+        return Cursor(server_side_parameters=self.server_side_parameters)
 
 
 class SessionConnectionWrapper(object):