Feature/drop relation/ct 2581 (dbt-labs#7626)

* changie
* move drop_relation macros into their own file, add scenarios for table, view, and materialized view

.changes/unreleased/Features-20230515-122304.yaml

@@ -0,0 +1,7 @@
+kind: Features
+body: Update drop_relation macro to allow for configuration of drop statement separately
+  from object name
+time: 2023-05-15T12:23:04.177141-04:00
+custom:
+  Author: mikealfare
+  Issue: "7625"

core/dbt/include/global_project/macros/adapters/drop_relation.sql

@@ -0,0 +1,44 @@
+{% macro drop_relation(relation) -%}
+    {{ return(adapter.dispatch('drop_relation', 'dbt')(relation)) }}
+{% endmacro %}
+
+{% macro default__drop_relation(relation) -%}
+    {% call statement('drop_relation', auto_begin=False) -%}
+        {%- if relation.is_table -%}
+            {{- drop_table(relation) -}}
+        {%- elif relation.is_view -%}
+            {{- drop_view(relation) -}}
+        {%- elif relation.is_materialized_view -%}
+            {{- drop_materialized_view(relation) -}}
+        {%- else -%}
+            drop {{ relation.type }} if exists {{ relation }} cascade
+        {%- endif -%}
+    {%- endcall %}
+{% endmacro %}
+
+
+{% macro drop_table(relation) -%}
+  {{ return(adapter.dispatch('drop_table', 'dbt')(relation)) }}
+{%- endmacro %}
+
+{% macro default__drop_table(relation) -%}
+    drop table if exists {{ relation }} cascade
+{%- endmacro %}
+
+
+{% macro drop_view(relation) -%}
+  {{ return(adapter.dispatch('drop_view', 'dbt')(relation)) }}
+{%- endmacro %}
+
+{% macro default__drop_view(relation) -%}
+    drop view if exists {{ relation }} cascade
+{%- endmacro %}
+
+
+{% macro drop_materialized_view(relation) -%}
+  {{ return(adapter.dispatch('drop_materialized_view', 'dbt')(relation)) }}
+{%- endmacro %}
+
+{% macro default__drop_materialized_view(relation) -%}
+    drop materialized view if exists {{ relation }} cascade
+{%- endmacro %}

core/dbt/include/global_project/macros/adapters/relation.sql

@@ -31,16 +31,6 @@
     {{ return(backup_relation) }}
 {% endmacro %}
 
-{% macro drop_relation(relation) -%}
-  {{ return(adapter.dispatch('drop_relation', 'dbt')(relation)) }}
-{% endmacro %}
-
-{% macro default__drop_relation(relation) -%}
-  {% call statement('drop_relation', auto_begin=False) -%}
-    drop {{ relation.type }} if exists {{ relation }} cascade
-  {%- endcall %}
-{% endmacro %}
-
 
 {% macro truncate_relation(relation) -%}
   {{ return(adapter.dispatch('truncate_relation', 'dbt')(relation)) }}