Another update from ingydotnet^djgoku

Task/Hash-join/Rust/hash-join.rust

@@ -0,0 +1,24 @@
+use std::collections::HashMap;
+
+fn main() {
+    let table_a = vec![
+        (27, "Jonah"), (18, "Alan"), (28, "Glory"),
+        (18, "Popeye"), (28, "Alan")
+    ];
+    let table_b = vec![
+        ("Jonah", "Whales"), ("Jonah", "Spiders"), ("Alan", "Ghosts"),
+        ("Alan", "Zombies"), ("Glory", "Buffy")
+    ];
+    // hash phase
+    let mut h = HashMap::new();
+    for (i, a) in table_a.iter().enumerate() {
+        h.entry(a.1).or_insert(vec![]).push(i);
+    }
+    // join phase
+    for b in table_b {
+        for i in h.get(b.0).unwrap_or(&vec![]) {
+            let a = table_a.get(*i).unwrap();
+            println!("{:?} {:?}", a, b);
+        }
+    }
+}