added macro for wh selection (#503)

* added macro for wh selection

* added changes

* init push of takeover of pr:115

* remove original commmunity changie entry and remove a variable type definition.

---------

Co-authored-by: Javier Calvo <javier.calvo.martinez@gmail.com>

.changes/unreleased/Features-20230307-140933.yaml

@@ -0,0 +1,6 @@
+kind: Features
+body: take over pr:103 to allow Macro for custom warehouse selection
+time: 2023-03-07T14:09:33.713772-06:00
+custom:
+  Author: javiCalvo
+  Issue: "438"

dbt/adapters/snowflake/impl.py

@@ -18,6 +18,9 @@
 from dbt.utils import filter_null_values
 
 
+SNOWFLAKE_WAREHOUSE_MACRO_NAME = "snowflake_warehouse"
+
+
 @dataclass
 class SnowflakeConfig(AdapterConfig):
     transient: Optional[bool] = None
@@ -71,8 +74,10 @@ def _get_warehouse(self) -> str:
             raise DbtRuntimeError("Could not get current warehouse: no results")
         return str(table[0][0])
 
-    def _use_warehouse(self, warehouse: str):
+    def _use_warehouse(self, warehouse):
         """Use the given warehouse. Quotes are never applied."""
+        kwargs = {"warehouse": warehouse}
+        warehouse = self.execute_macro(SNOWFLAKE_WAREHOUSE_MACRO_NAME, kwargs=kwargs)  # type: ignore
         self.execute("use warehouse {}".format(warehouse))
 
     def pre_model_hook(self, config: Mapping[str, Any]) -> Optional[str]:

dbt/include/snowflake/macros/etc.sql

@@ -0,0 +1,3 @@
+{% macro snowflake_warehouse(warehouse) -%}
+  {{ return(warehouse) }}
+{%- endmacro %}