feat(Go-Tool)：2020/11/23：修改项目案例(按照一定规则对一组数据进行排序分组)

vendor/github.com/ahmetb/go-linq/union.go

@@ -0,0 +1,40 @@
+package linq
+
+// Union produces the set union of two collections.
+//
+// This method excludes duplicates from the return set. This is different
+// behavior to the Concat method, which returns all the elements in the input
+// collection including duplicates.
+func (q Query) Union(q2 Query) Query {
+	return Query{
+		Iterate: func() Iterator {
+			next := q.Iterate()
+			next2 := q2.Iterate()
+
+			set := make(map[interface{}]bool)
+			use1 := true
+
+			return func() (item interface{}, ok bool) {
+				if use1 {
+					for item, ok = next(); ok; item, ok = next() {
+						if _, has := set[item]; !has {
+							set[item] = true
+							return
+						}
+					}
+
+					use1 = false
+				}
+
+				for item, ok = next2(); ok; item, ok = next2() {
+					if _, has := set[item]; !has {
+						set[item] = true
+						return
+					}
+				}
+
+				return
+			}
+		},
+	}
+}