first version of obidemerge, obijoin and a new filter for obicleandb but to be finnished

Former-commit-id: 8a1ed26e5548c30db75644c294d478ec4d753f19

pkg/obistats/sort.go

@@ -0,0 +1,37 @@
+package obistats
+
+//
+// Dupplicated code from internal module available at :
+// https://github.com/golang-design/bench.git
+//
+
+import (
+	"math"
+	"sort"
+)
+
+// An Order defines a sort order for a table.
+// It reports whether t.Rows[i] should appear before t.Rows[j].
+type Order func(t *Table, i, j int) bool
+
+// ByName sorts tables by the Benchmark name column
+func ByName(t *Table, i, j int) bool {
+	return t.Rows[i].Benchmark < t.Rows[j].Benchmark
+}
+
+// ByDelta sorts tables by the Delta column,
+// reversing the order when larger is better (for "speed" results).
+func ByDelta(t *Table, i, j int) bool {
+	return math.Abs(t.Rows[i].PctDelta)*float64(t.Rows[i].Change) <
+		math.Abs(t.Rows[j].PctDelta)*float64(t.Rows[j].Change)
+}
+
+// Reverse returns the reverse of the given order.
+func Reverse(order Order) Order {
+	return func(t *Table, i, j int) bool { return order(t, j, i) }
+}
+
+// Sort sorts a Table t (in place) by the given order.
+func Sort(t *Table, order Order) {
+	sort.SliceStable(t.Rows, func(i, j int) bool { return order(t, i, j) })
+}