Data commit

Task/Hash-join/Go/hash-join.go

@@ -0,0 +1,31 @@
+package main
+
+import "fmt"
+
+func main() {
+    tableA := []struct {
+        value int
+        key   string
+    }{
+        {27, "Jonah"}, {18, "Alan"}, {28, "Glory"}, {18, "Popeye"},
+        {28, "Alan"},
+    }
+    tableB := []struct {
+        key   string
+        value string
+    }{
+        {"Jonah", "Whales"}, {"Jonah", "Spiders"},
+        {"Alan", "Ghosts"}, {"Alan", "Zombies"}, {"Glory", "Buffy"},
+    }
+    // hash phase
+    h := map[string][]int{}
+    for i, r := range tableA {
+        h[r.key] = append(h[r.key], i)
+    }
+    // join phase
+    for _, x := range tableB {
+        for _, a := range h[x.key] {
+            fmt.Println(tableA[a], x)
+        }
+    }
+}