Indroduce clusterProperty option for aggregation (#15287)

* indroduce clusterProperty option for aggregation

* remove unnecessary codes

* update geojson_option conversion

* fix reviewing findings

1 files changed, 6 insertions, 2 deletions

diff --git a/src/mbgl/style/expression/expression.cpp b/src/mbgl/style/expression/expression.cpp
index d61f435eec..6bfda99064 100644
--- a/src/mbgl/style/expression/expression.cpp
+++ b/src/mbgl/style/expression/expression.cpp
@@ -25,13 +25,17 @@ public:
         return optional<mbgl::Value>();
     }
 };
-
-
+      
 EvaluationResult Expression::evaluate(optional<float> zoom, const Feature& feature, optional<double> colorRampParameter) const {
     GeoJSONFeature f(feature);
     return this->evaluate(EvaluationContext(zoom, &f, colorRampParameter));
 }
 
+EvaluationResult Expression::evaluate(optional<mbgl::Value> accumulated, const Feature& feature) const {
+    GeoJSONFeature f(feature);
+    return this->evaluate(EvaluationContext(accumulated, &f));
+}
+
 } // namespace expression
 } // namespace style
 } // namespace mbgl