Add basic error test, fix minor merge conflict

dbt/adapters/clickhouse/dbclient.py

@@ -150,7 +150,11 @@ def _ensure_database(self, database_engine, cluster_name) -> None:
             db_exists = self.command(check_db)
             if not db_exists:
                 engine_clause = f' ENGINE {database_engine} ' if database_engine else ''
-                cluster_clause = f' ON CLUSTER "{cluster_name}" ' if cluster_name is not None else ''
+                cluster_clause = (
+                    f' ON CLUSTER {cluster_name} '
+                    if cluster_name is not None and cluster_name.strip() != ''
+                    else ''
+                )
                 self.command(f'CREATE DATABASE {self.database}{cluster_clause}{engine_clause}')
                 db_exists = self.command(check_db)
                 if not db_exists:

tests/integration/adapter/test_errors.py

@@ -0,0 +1,30 @@
+import pytest
+from dbt.tests.util import run_dbt
+
+oom_table_sql = """
+SELECT a FROM system.numbers_mt GROUP BY repeat(toString(number), 100000) as a
+"""
+
+schema_yaml = """
+version: 2
+
+models:
+  - name: oom_table
+    description: Table that generates OOM
+    config:
+      materialized: table
+      order_by: a
+"""
+
+
+class TestOOMError:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "schema.yml": schema_yaml,
+            "oom_table.sql": oom_table_sql,
+        }
+
+    def test_oom(self, project):
+        res = run_dbt(["run"], expect_pass=False)
+        assert 'exceeded' in res.results[0].message