backfill missing Mul type

virtdata-lib-basics/src/main/java/io/nosqlbench/virtdata/library/basics/shared/from_long/to_double/Mul.java

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2022-2023 nosqlbench
+ *
+ * Licensed 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 io.nosqlbench.virtdata.library.basics.shared.from_long.to_double;
+
+import io.nosqlbench.virtdata.api.annotations.Categories;
+import io.nosqlbench.virtdata.api.annotations.Category;
+import io.nosqlbench.virtdata.api.annotations.ThreadSafeMapper;
+
+import java.util.function.LongToDoubleFunction;
+
+@ThreadSafeMapper
+@Categories({Category.general})
+public class Mul implements LongToDoubleFunction {
+    private final double factor;
+
+    public Mul(double factor) {
+        this.factor = factor;
+    }
+
+    @Override
+    public double applyAsDouble(long value) {
+        return factor * value;
+    }
+}