Fix aggregation and value type (#57)

* Fix aggregation and value type
* Add changelog

Author: Superskyyy

CHANGES.md

@@ -2,6 +2,17 @@ Changes by Version
 ==================
 Release Notes.
 
+0.7.0
+------------------
+
+### Features
+
+
+### Bugs
+
+* Fix MeasureQuery.SumBy to use SUM instead of COUNT
+* Add missing FloatFieldValue type in the Measure write operation
+
 0.6.0
 ------------------
 

src/main/java/org/apache/skywalking/banyandb/v1/client/MeasureQuery.java

@@ -110,7 +110,7 @@ public MeasureQuery sumBy(String field, Set<String> groupByKeys) {
         Preconditions.checkArgument(fieldProjections.contains(field), "field should be selected first");
         Preconditions.checkArgument(this.tagProjections.containsAll(groupByKeys), "groupBy tags should be selected first");
         Preconditions.checkState(this.aggregation == null, "aggregation should only be set once");
-        this.aggregation = new Aggregation(field, Aggregation.Type.COUNT, groupByKeys);
+        this.aggregation = new Aggregation(field, Aggregation.Type.SUM, groupByKeys);
         return this;
     }
 

src/main/java/org/apache/skywalking/banyandb/v1/client/Value.java

@@ -253,6 +253,20 @@ public BanyandbModel.FieldValue serialize() {
         }
     }
 
+    /**
+     * The value of a float type field.
+     */
+    public static class FloatFieldValue extends Value<Float> implements Serializable<BanyandbModel.FieldValue> {
+        private FloatFieldValue(Float value) {
+            super(value);
+        }
+
+        @Override
+        public BanyandbModel.FieldValue serialize() {
+            return BanyandbModel.FieldValue.newBuilder().setFloat(BanyandbModel.Float.newBuilder().setValue(value)).build();
+        }
+    }
+
     /**
      * Construct a numeric tag
      *