fix(factors/engine): 修复列选择时基础列重复的问题

src/factors/engine/data_router.py

@@ -262,10 +262,11 @@ class DataRouter:
         if stock_codes is not None:
             df = df.filter(pl.col("ts_code").is_in(stock_codes))
 
-        # 选择需要的列
-        select_cols = ["ts_code", "trade_date"] + [
-            c for c in columns if c in df.columns
-        ]
+        # 选择需要的列（避免重复）
+        base_cols = ["ts_code", "trade_date"]
+        extra_cols = [c for c in columns if c in df.columns and c not in base_cols]
+        select_cols = base_cols + extra_cols
+
         return df.select(select_cols)
 
     def _load_from_database(
@@ -314,10 +315,10 @@ class DataRouter:
             if col not in df.columns and col not in ["ts_code", "trade_date"]:
                 raise ValueError(f"表 {table_name} 缺少字段: {col}")
 
-        # 选择需要的列
-        select_cols = ["ts_code", "trade_date"] + [
-            c for c in columns if c in df.columns
-        ]
+        # 选择需要的列（避免重复）
+        base_cols = ["ts_code", "trade_date"]
+        extra_cols = [c for c in columns if c in df.columns and c not in base_cols]
+        select_cols = base_cols + extra_cols
 
         return df.select(select_cols)