feat: ArrayOfNumbersSketch interface & update sketch

README.md

@@ -68,7 +68,7 @@ If you are interested in making contributions to this site please see our [Commu
 | Cardinality/FM85 | UniqueCountMap  | ❌ |
 | Cardinality/Tuple	| | |
 | 	| FdtSketch | ❌ |
-| 	| ArrayOfDoublesSketch  | ❌ |
+| 	| ArrayOfDoublesSketch  | 🚧 |
 | 	| DoubleSketch  | ❌ |
 | 	| IntegerSketch  | ❌ |
 |	| ArrayOfStringsSketch | ❌ |

tuple/arrayofnumbers_sketch.go

@@ -0,0 +1,78 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package tuple
+
+// Number constraint for types that can be used in ArrayOfNumbersSummary.
+// NOTE: Only allowed fixed-size type.
+type Number interface {
+	~int8 | ~int16 | ~int32 | ~int64 |
+		~uint8 | ~uint16 | ~uint32 | ~uint64 |
+		~float32 | ~float64
+}
+
+type ArrayOfNumbersSketch[V Number] interface {
+	Sketch[*ArrayOfNumbersSummary[V]]
+
+	// NumValuesInSummary returns the number of values in ArrayOfNumbersSummary.
+	NumValuesInSummary() uint8
+}
+
+// ArrayOfNumbersSummary is a fixed-size array of numeric values used as a summary in tuple sketches.
+type ArrayOfNumbersSummary[T Number] struct {
+	values []T
+	size   uint8
+}
+
+func newArrayOfNumbersSummary[T Number](size uint8) *ArrayOfNumbersSummary[T] {
+	return &ArrayOfNumbersSummary[T]{
+		values: make([]T, size),
+		size:   size,
+	}
+}
+
+func newArrayOfNumbersSummaryFromValues[T Number](values []T, size uint8) *ArrayOfNumbersSummary[T] {
+	return &ArrayOfNumbersSummary[T]{
+		values: values,
+		size:   size,
+	}
+}
+
+// Reset clears the content of the summary, restoring it to its initial state.
+func (s *ArrayOfNumbersSummary[T]) Reset() {
+	s.values = make([]T, s.size)
+}
+
+// Clone creates and returns a deep copy of the current Summary instance.
+func (s *ArrayOfNumbersSummary[T]) Clone() Summary {
+	return &ArrayOfNumbersSummary[T]{
+		values: append([]T{}, s.values...),
+		size:   s.size,
+	}
+}
+
+// Update incorporates a new value into the summary, modifying its internal state based on the given input value.
+func (s *ArrayOfNumbersSummary[T]) Update(values []T) {
+	for i := 0; i < int(s.size); i++ {
+		s.values[i] += values[i]
+	}
+}
+
+// Values returns the values in the summary.
+func (s *ArrayOfNumbersSummary[T]) Values() []T {
+	return s.values
+}