fix

Author: DongLiang-0

platform/model/bucket_aggregations/date_histogram.go

@@ -222,21 +222,7 @@ func (query *DateHistogram) generateSQLForCalendarInterval() model.Expr {
 }
 
 func (query *DateHistogram) getKey(row model.QueryResultRow) int64 {
-	value := row.Cols[len(row.Cols)-2].Value
-	switch v := value.(type) {
-	case int64:
-		return v
-	case string:
-		val, err := strconv.ParseInt(v, 10, 64)
-		if err != nil {
-			logger.Error().Msgf("string conver to int64 failed %T", v)
-			return 0
-		}
-		return val
-	default:
-		logger.Error().Msgf("unsupported key type: %T", v)
-		return 0
-	}
+	return extractRowValue(row)
 }
 
 func (query *DateHistogram) Interval() (interval time.Duration, ok bool) {
@@ -430,6 +416,10 @@ func (qt *DateHistogramRowsTransformer) Transform(ctx context.Context, rowsFromD
 }
 
 func (qt *DateHistogramRowsTransformer) getKey(row model.QueryResultRow) int64 {
+	return extractRowValue(row)
+}
+
+func extractRowValue(row model.QueryResultRow) int64 {
 	value := row.Cols[len(row.Cols)-2].Value
 	switch v := value.(type) {
 	case int64: