From d1abf2e9a6ed9925c6c2bf54e3ef2e6fa0ed4656 Mon Sep 17 00:00:00 2001
From: Anatoliy Romanov <gogoff1@gmail.com>
Date: Tue, 12 Aug 2025 15:39:37 +0300
Subject: [PATCH] fix: set require_alias=False to fix --empty flag alias errors

---
 dbt/adapters/clickhouse/relation.py           |  1 +
 .../adapter/compile/test_empty_flag.py        | 62 +++++++++++++++++++
 2 files changed, 63 insertions(+)
 create mode 100644 tests/integration/adapter/compile/test_empty_flag.py

diff --git a/dbt/adapters/clickhouse/relation.py b/dbt/adapters/clickhouse/relation.py
index f5ca86d1..b8d36ba1 100644
--- a/dbt/adapters/clickhouse/relation.py
+++ b/dbt/adapters/clickhouse/relation.py
@@ -44,6 +44,7 @@ class ClickHouseRelation(BaseRelation):
     quote_character: str = '`'
     can_exchange: bool = False
     can_on_cluster: bool = False
+    require_alias: bool = False
 
     def __post_init__(self):
         if self.database != self.schema and self.database:
diff --git a/tests/integration/adapter/compile/test_empty_flag.py b/tests/integration/adapter/compile/test_empty_flag.py
new file mode 100644
index 00000000..727bc264
--- /dev/null
+++ b/tests/integration/adapter/compile/test_empty_flag.py
@@ -0,0 +1,62 @@
+import pytest
+from dbt.tests.util import run_dbt
+
+
+class TestAliasesWithEmptyFlag:
+    @pytest.fixture(scope="class")
+    def models(self):
+        return {
+            "base_table.sql": """
+                {{ config(materialized='table') }}
+                SELECT 1 as id, 'test' as name, true as active
+            """,
+            "model_with_alias.sql": """
+                {{ config(materialized='table') }}
+                SELECT 
+                    base_alias.id,
+                    base_alias.name,
+                    base_alias.active
+                FROM {{ ref('base_table') }} base_alias
+                WHERE base_alias.active = true
+            """,
+
+            "incremental_base_table.sql": """
+                {{ config(materialized='table') }}
+                SELECT 1 as event_id, 'login' as event_type, '2023-01-01'::date as event_date
+                UNION ALL
+                SELECT 2 as event_id, 'logout' as event_type, '2023-01-02'::date as event_date
+            """,
+            "incremental_with_alias.sql": """
+                {{ config(
+                    materialized='incremental',
+                    incremental_strategy='append',
+                    unique_key='event_id'
+                ) }}
+                SELECT 
+                    src_alias.event_id,
+                    src_alias.event_type,
+                    src_alias.event_date
+                FROM {{ ref('incremental_base_table') }} src_alias
+            """,
+
+            "view_with_alias.sql": """
+                {{ config(materialized='view') }}
+                SELECT 
+                    base_alias.id,
+                    base_alias.name
+                FROM {{ ref('base_table') }} base_alias
+                WHERE base_alias.name = 'test'
+            """
+        }
+
+    def test_alias_with_empty_flag(self, project):
+        def run_and_assert(select_model):
+            results = run_dbt(["run", "--empty", "--select", select_model])
+            assert len(results) == 1
+            assert results[0].status.lower() == "success"
+
+        run_dbt(["run", "--select", "base_table incremental_base_table"])
+
+        run_and_assert("model_with_alias")
+        run_and_assert("incremental_with_alias")
+        run_and_assert("view_with_alias")