减少文本因子读取临时分配

crates/fidc-core/src/data.rs

@@ -2449,6 +2449,13 @@ impl DataSet {
             .unwrap_or_default()
     }
 
+    pub fn factor_text_rows_on(&self, date: NaiveDate) -> &[FactorTextValue] {
+        self.factor_text_by_date
+            .get(&date)
+            .map(Vec::as_slice)
+            .unwrap_or(&[])
+    }
+
     pub fn market_snapshots_on(&self, date: NaiveDate) -> Vec<&DailyMarketSnapshot> {
         self.market_by_date
             .get(&date)

crates/fidc-core/src/platform_expr_strategy.rs

@@ -3687,8 +3687,8 @@ impl PlatformExprStrategy {
             },
             available_text_factor_names: if self.stock_text_factors_required {
                 ctx.data
-                    .factor_text_snapshots_on(date)
-                    .into_iter()
+                    .factor_text_rows_on(date)
+                    .iter()
                     .map(|row| row.field.clone())
                     .collect()
             } else {
@@ -4081,8 +4081,8 @@ impl PlatformExprStrategy {
             extra_factors,
             extra_text_factors: if self.stock_text_factors_required {
                 ctx.data
-                    .factor_text_snapshots_on(date)
-                    .into_iter()
+                    .factor_text_rows_on(date)
+                    .iter()
                     .filter(|row| row.symbol == symbol)
                     .map(|row| (row.field.clone(), row.value.clone()))
                     .collect()