Add ability to configure index names

plugins/postgres/dbt/adapters/postgres/impl.py

@@ -28,8 +28,17 @@ class PostgresIndexConfig(dbtClassMixin):
     columns: List[str]
     unique: bool = False
     type: Optional[str] = None
+    name: Optional[str] = None
 
     def render(self, relation):
+        # Use the index name if given
+        # Otherwise, generate a unique index name
+        if self.name:
+            return self.name
+        else:
+            return self.default_index_name(relation)
+
+    def default_index_name(self, relation):
         # We append the current timestamp to the index name because otherwise
         # the index will only be created on every other run. See
         # https://github.com/dbt-labs/dbt-core/issues/1945#issuecomment-576714925

plugins/postgres/dbt/adapters/postgres/relation_configs/index.py

@@ -29,7 +29,7 @@ class PostgresIndexMethod(StrEnum):
 @dataclass(frozen=True, eq=True, unsafe_hash=True)
 class PostgresIndexConfig(RelationConfigBase, RelationConfigValidationMixin):
     """
-    This config fallows the specs found here:
+    This config follows the specs found here:
     https://www.postgresql.org/docs/current/sql-createindex.html
 
     The following parameters are configurable by dbt:
@@ -76,6 +76,7 @@ class PostgresIndexConfig(RelationConfigBase, RelationConfigValidationMixin):
     @classmethod
     def parse_model_node(cls, model_node_entry: dict) -> dict:
         config_dict = {
+            "name": model_node_entry.get("name"),
             "column_names": set(model_node_entry.get("columns", set())),
             "unique": model_node_entry.get("unique"),
             "method": model_node_entry.get("type"),
@@ -98,10 +99,12 @@ class PostgresIndexConfig(RelationConfigBase, RelationConfigValidationMixin):
         Returns: a dictionary that can be passed into `get_create_index_sql()`
         """
         node_config = {
+            "name": self.name,
             "columns": list(self.column_names),
             "unique": self.unique,
-            "type": self.method.value,
+            "type": self.method,
         }
+
         return node_config