20420: Fixes bug where SDM caches would not always be properly cleare…

…d between queries (#142)

src/Amalgam/GeneralizedDistance.h

@@ -1364,6 +1364,18 @@ class RepeatedGeneralizedDistanceEvaluator
 			internedNumberIndexToNumberValue(nullptr)
 		{	}
 
+		//clears all the feature data
+		void Clear()
+		{
+			effectiveFeatureType = EFDT_CONTINUOUS_NUMERIC;
+			precomputedRemainingIdenticalDistanceTerm = 0.0;
+			internedNumberIndexToNumberValue = nullptr;
+			internedDistanceTerms.clear();
+			nominalStringDistanceTerms.clear();
+			nominalNumberDistanceTerms.clear();
+			precomputedNominalDistanceTermsHighAccuracy = false;
+		}
+
 		//sets the value for a precomputed distance term that will apply to the rest of the distance
 		//evaluations and changes the feature type appropriately
 		inline void SetPrecomputedRemainingIdenticalDistanceTerm(double dist_term)

src/Amalgam/SeparableBoxFilterDataStore.cpp

@@ -1440,8 +1440,7 @@ void SeparableBoxFilterDataStore::PopulateTargetValueAndLabelIndex(RepeatedGener
 	auto &feature_data = r_dist_eval.featureData[query_feature_index];
 	auto &effective_feature_type = r_dist_eval.featureData[query_feature_index].effectiveFeatureType;
 
-	feature_data.internedNumberIndexToNumberValue = nullptr;
-	feature_data.internedDistanceTerms.clear();
+	feature_data.Clear();
 
 	if(feature_attribs.IsFeatureNominal()
 		|| feature_type == GeneralizedDistanceEvaluator::FDT_CONTINUOUS_STRING