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+  http://www.apache.org/licenses/LICENSE-2.0
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+-->
+
+# 新加case注意事项
+
+1. 变量名前要写 def，否则是全局变量，并行跑的 case 的时候可能被其他 case 影响。
+
+    Problematic code:
+    ```
+    ret = ***
+    ```
+    Correct code:
+    ```
+    def ret = ***
+    ```
+2. 尽量不要在 case 中 global 的设置 session variable，也可能会影响其他 case。
+
+    Problematic code:
+    ```
+    sql """set global enable_pipeline_x_engine=true;"""
+    ```
+    Correct code:
+    ```
+    sql """set enable_pipeline_x_engine=true;"""
+    ```
+3. case 中涉及时间相关的，最好固定时间，不要用类似 now() 函数这种动态值，避免过一段时间后 case 就跑不过了。
+
+    Problematic code:
+    ```
+    sql """select count(*) from table where created < now();"""
+    ```
+    Correct code:
+    ```
+    sql """select count(*) from table where created < '2023-11-13';"""
+    ```