fix(aggregator): enable Count aggregator to handle any data type

aggregator/group_aggregator.go

@@ -291,8 +291,13 @@ func (ga *GroupAggregator) Add(data interface{}) error {
 			continue
 		}
 
-		// Dynamically check if numeric conversion is needed
-		if ga.isNumericAggregator(aggType) {
+		// Special handling for Count aggregator - it can handle any type
+		if aggType == Count {
+			// Count can handle any non-null value
+			if groupAgg, exists := ga.groups[key][outputAlias]; exists {
+				groupAgg.Add(fieldVal)
+			}
+		} else if ga.isNumericAggregator(aggType) {
 			// For numeric aggregation functions, try to convert to numeric type
 			if numVal, err := cast.ToFloat64E(fieldVal); err == nil {
 				if groupAgg, exists := ga.groups[key][outputAlias]; exists {

aggregator/group_aggregator_test.go

@@ -668,7 +668,7 @@ func TestGroupAggregatorDataTypes(t *testing.T) {
 				{"group": "B", "value": "test"},
 			},
 			expectedKey: "count",
-			expectedVal: 0.0, // Count聚合器可能只计算数值
+			expectedVal: 2.0, // Count聚合器计算所有非空值
 		},
 		{
 			name:    "Boolean Count",
@@ -680,7 +680,7 @@ func TestGroupAggregatorDataTypes(t *testing.T) {
 				{"group": "B", "value": false},
 			},
 			expectedKey: "count",
-			expectedVal: 0.0, // Count聚合器可能只计算数值
+			expectedVal: 3.0, // Count聚合器计算所有非空值
 		},
 		{
 			name:    "Mixed Types Count",
@@ -692,7 +692,7 @@ func TestGroupAggregatorDataTypes(t *testing.T) {
 				{"group": "B", "value": 456},
 			},
 			expectedKey: "count",
-			expectedVal: 1.0, // 只有123是数值
+			expectedVal: 3.0, // Count聚合器计算所有非空值
 		},
 	}