diff --git a/.changes/unreleased/Changed-20250115-095239.yaml b/.changes/unreleased/Changed-20250115-095239.yaml
new file mode 100644
index 00000000..a74a5e89
--- /dev/null
+++ b/.changes/unreleased/Changed-20250115-095239.yaml
@@ -0,0 +1,3 @@
+kind: Changed
+body: Allow aggregating indexes without key columns to be specified.
+time: 2025-01-15T09:52:39.233654Z
diff --git a/dbt/adapters/firebolt/connections.py b/dbt/adapters/firebolt/connections.py
index 7f5c4983..327d00cd 100644
--- a/dbt/adapters/firebolt/connections.py
+++ b/dbt/adapters/firebolt/connections.py
@@ -20,6 +20,7 @@
 )
 from firebolt.client import DEFAULT_API_URL
 from firebolt.client.auth import Auth, ClientCredentials, UsernamePassword
+from firebolt.common._types import ExtendedType
 from firebolt.db import ARRAY, DECIMAL
 from firebolt.db import connect as sdk_connect
 from firebolt.db.connection import Connection as SDKConnection
@@ -191,8 +192,8 @@ def cancel(self, connection: Connection) -> None:
         raise NotImplementedError('`cancel` is not implemented for this adapter!')
 
     @classmethod
-    def data_type_code_to_name(  # type: ignore[override] # FIR-29423
-        cls, type_code: Union[type, ARRAY, DECIMAL]
+    def data_type_code_to_name(
+        cls, type_code: Union[type, ExtendedType]  # type: ignore[override] # FIR-29423
     ) -> str:
         """
         Convert a Firebolt data type code to a string representing the data type.
@@ -218,6 +219,7 @@ def data_type_code_to_name(  # type: ignore[override] # FIR-29423
                 return 'bytea'
             else:
                 return 'text'
+        return 'text'
 
 
 def _determine_auth(credentials: FireboltCredentials) -> Auth:
diff --git a/dbt/adapters/firebolt/impl.py b/dbt/adapters/firebolt/impl.py
index add2b137..337f7c3d 100644
--- a/dbt/adapters/firebolt/impl.py
+++ b/dbt/adapters/firebolt/impl.py
@@ -120,13 +120,12 @@ def parse(cls, raw_index: Optional[Mapping]) -> Optional['FireboltIndexConfig']:
                     'for join indexes.'
                 )
             if index_config.index_type.upper() == 'AGGREGATING' and not (
-                index_config.key_columns and index_config.aggregation
+                index_config.aggregation
             ):
                 raise CompilationError(
                     'Invalid aggregating index definition:\n'
                     f'  Got: {index_config}.\n'
-                    '  key_columns and aggregation must be specified '
-                    'for aggregating indexes.'
+                    '  aggregation must be specified for aggregating indexes.'
                 )
             return index_config
         except ValidationError as exc:
diff --git a/dbt/include/firebolt/macros/adapters.sql b/dbt/include/firebolt/macros/adapters.sql
index 139fd03b..3dea836e 100644
--- a/dbt/include/firebolt/macros/adapters.sql
+++ b/dbt/include/firebolt/macros/adapters.sql
@@ -75,18 +75,20 @@
        create_statement (str): either "CREATE JOIN INDEX" or
                                "CREATE AND GENERATE AGGREGATING INDEX"
        spine_col ([str]):
-         if agg index, key columns
+         if agg index, key columns - can be none
          if join index, join column
        other_col ([str]):
          if agg index, aggregating columns
          if join index, dimension column
        #}
   {{ create_statement }} "{{ index_name }}" ON {{ relation }} (
-      {% if spine_col is iterable and spine_col is not string -%}
-          {{ spine_col | join(', ') }},
-      {% else -%}
-          {{ spine_col }},
-      {% endif -%}
+      {% if spine_col -%}
+        {% if spine_col is iterable and spine_col is not string -%}
+            {{ spine_col | join(', ') }},
+        {% else -%}
+            {{ spine_col }},
+        {% endif -%}
+      {%- endif -%}
       {% if other_col is iterable and other_col is not string -%}
           {{ other_col | join(', ') }}
       {%- else -%}
diff --git a/tests/unit/test_index.py b/tests/unit/test_index.py
index cfaf7177..a9eaacc2 100644
--- a/tests/unit/test_index.py
+++ b/tests/unit/test_index.py
@@ -73,6 +73,17 @@ def test_firebolt_index_config_parse():
     assert index_config.dimension_column == '"dimension"'
 
 
+def test_firebolt_index_config_no_key_columns():
+    raw_index = {
+        'index_type': 'aggregating',
+        'aggregation': 'COUNT(*)',
+    }
+    index_config = FireboltIndexConfig.parse(raw_index)
+    assert index_config.index_type == 'aggregating'
+    assert index_config.key_columns is None
+    assert index_config.aggregation == 'COUNT(*)'
+
+
 @pytest.mark.parametrize(
     'raw_index',
     [
@@ -84,8 +95,6 @@ def test_firebolt_index_config_parse():
         },
         # missing dimension column
         {'index_type': 'join', 'join_columns': ['column1']},
-        # missing aggregation
-        {'index_type': 'aggregating', 'key_columns': ['key1']},
         # missing aggregation but containing extra columns
         {
             'index_type': 'aggregating',