From 0108c91bae60101e26d6319036098c93cb954cf0 Mon Sep 17 00:00:00 2001
From: boris <shuaibo.zhang@hotmail.com>
Date: Wed, 9 Sep 2026 09:35:25 +0800
Subject: [PATCH] perf: preserve borrowed factor keys in stock state

---
 crates/fidc-core/src/platform_expr_strategy.rs | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/crates/fidc-core/src/platform_expr_strategy.rs b/crates/fidc-core/src/platform_expr_strategy.rs
index 7b0582b..b8f3ad6 100644
--- a/crates/fidc-core/src/platform_expr_strategy.rs
+++ b/crates/fidc-core/src/platform_expr_strategy.rs
@@ -13,7 +13,7 @@ use crate::data::EligibleUniverseSnapshot;
 use crate::data::{
     BACKWARD_ADJUSTMENT_FACTOR_FIELD, CandidateEligibility, DailyFactorSnapshot,
     DailyMarketSnapshot, DailySnapshotView, DataSet, PriceField, decision_free_float_cap_bn,
-    decision_market_cap_bn,
+    NumericFactorMap, decision_market_cap_bn,
 };
 use crate::engine::BacktestError;
 use crate::events::OrderSide;
@@ -954,7 +954,7 @@ struct StockExpressionState {
     stock_volume_ma60: f64,
     stock_volume_ma100: f64,
     current_series_end: Option<usize>,
-    extra_factors: BTreeMap<String, f64>,
+    extra_factors: NumericFactorMap,
     extra_text_factors: BTreeMap<String, String>,
 }
 
@@ -4767,7 +4767,7 @@ impl PlatformExprStrategy {
                     self.stock_extra_factor_map_required
                         || self.stock_extra_factor_identifiers.contains(field.as_ref())
                 })
-                .map(|(field, value)| (field.to_string(), *value))
+                .map(|(field, value)| (field.clone(), *value))
                 .collect()
         } else {
             BTreeMap::new()
@@ -4785,7 +4785,7 @@ impl PlatformExprStrategy {
                         .and_then(|row| row.extra_factors.get(field.as_str()))
                         .copied()
                         .unwrap_or(f64::NAN);
-                    extra_factors.insert(field.clone(), value);
+                    extra_factors.insert(field.clone().into(), value);
                 }
             }
         }
@@ -4796,7 +4796,10 @@ impl PlatformExprStrategy {
                     .contains(BACKWARD_ADJUSTMENT_FACTOR_FIELD))
             && let Some(value) = factor.adjustment_factor_backward1
         {
-            extra_factors.insert(BACKWARD_ADJUSTMENT_FACTOR_FIELD.to_string(), value);
+            extra_factors.insert(
+                std::borrow::Cow::Borrowed(BACKWARD_ADJUSTMENT_FACTOR_FIELD),
+                value,
+            );
         }
 
         let state = StockExpressionState {