(improvement)(chat) add default aggregate to all metric and add group by to dimension and add metric filter in having (#150)

chat/api/src/main/java/com/tencent/supersonic/chat/api/pojo/SchemaElement.java

@@ -15,6 +15,7 @@ import lombok.NoArgsConstructor;
 @AllArgsConstructor
 @NoArgsConstructor
 public class SchemaElement implements Serializable {
+
     private Long model;
     private Long id;
     private String name;
@@ -26,6 +27,8 @@ public class SchemaElement implements Serializable {
 
     private List<SchemaValueMap> schemaValueMaps;
 
+    private String defaultAgg;
+
     @Override
     public boolean equals(Object o) {
         if (this == o) {