fix: failure when config from view to Iceberg table

dbt/include/athena/macros/materializations/models/table/table.sql

@@ -82,27 +82,36 @@
         {{ create_table_as(False, target_relation, sql) }}
       {%- endcall %}
     {%- else -%}
-      {%- if tmp_relation is not none -%}
-        {%- do drop_relation(tmp_relation) -%}
-      {%- endif -%}
-
-      {%- set old_relation_bkp = make_temp_relation(old_relation, '__bkp') -%}
-      -- If we have this, it means that at least the first renaming occurred but there was an issue
-      -- afterwards, therefore we are in weird state. The easiest and cleanest should be to remove
-      -- the backup relation. It won't have an impact because since we are in the else condition,
-      -- that means that old relation exists therefore no downtime yet.
-      {%- if old_relation_bkp is not none -%}
-        {%- do drop_relation(old_relation_bkp) -%}
+      {%- if old_relation.is_view -%}
+        {%- call statement('main') -%}
+          {{ create_table_as(False, tmp_relation, sql) }}
+        {%- endcall -%}
+        {%- do drop_relation(old_relation) -%}
+        {%- do rename_relation(tmp_relation, target_relation) -%}
+      {%- else -%}
+
+        {%- if tmp_relation is not none -%}
+          {%- do drop_relation(tmp_relation) -%}
+        {%- endif -%}
+
+        {%- set old_relation_bkp = make_temp_relation(old_relation, '__bkp') -%}
+        -- If we have this, it means that at least the first renaming occurred but there was an issue
+        -- afterwards, therefore we are in weird state. The easiest and cleanest should be to remove
+        -- the backup relation. It won't have an impact because since we are in the else condition,
+        -- that means that old relation exists therefore no downtime yet.
+        {%- if old_relation_bkp is not none -%}
+          {%- do drop_relation(old_relation_bkp) -%}
+        {%- endif -%}
+
+        {%- call statement('main') -%}
+          {{ create_table_as(False, tmp_relation, sql) }}
+        {%- endcall -%}
+
+        {{ rename_relation(old_relation, old_relation_bkp) }}
+        {{ rename_relation(tmp_relation, target_relation) }}
+
+        {{ drop_relation(old_relation_bkp) }}
       {%- endif -%}
-
-      {%- call statement('main') -%}
-        {{ create_table_as(False, tmp_relation, sql) }}
-      {%- endcall -%}
-
-      {{ rename_relation(old_relation, old_relation_bkp) }}
-      {{ rename_relation(tmp_relation, target_relation) }}
-
-      {{ drop_relation(old_relation_bkp) }}
     {%- endif -%}
 
   {%- endif -%}

tests/functional/adapter/test_change_relation_types.py

@@ -0,0 +1,26 @@
+import pytest
+
+from dbt.tests.adapter.relations.test_changing_relation_type import (
+    BaseChangeRelationTypeValidator,
+)
+
+
+class TestChangeRelationTypesHive(BaseChangeRelationTypeValidator):
+    pass
+
+
+class TestChangeRelationTypesIceberg(BaseChangeRelationTypeValidator):
+    @pytest.fixture(scope="class")
+    def project_config_update(self):
+        return {
+            "models": {
+                "+table_type": "iceberg",
+            }
+        }
+
+    def test_changing_materialization_changes_relation_type(self, project):
+        self._run_and_check_materialization("view")
+        self._run_and_check_materialization("table")
+        self._run_and_check_materialization("view")
+        # skip incremntal that doesn't work with Iceberg
+        self._run_and_check_materialization("table", extra_args=["--full-refresh"])