Update all new Tasks

Task/Hash-join/Deja-Vu/hash-join.djv

@@ -0,0 +1,19 @@
+hashJoin table1 index1 table2 index2:
+    local :h {}
+    # hash phase
+    for s in table1:
+        local :key s! index1
+        if not has h key:
+            set-to h key []
+        push-to h! key s
+    # join phase
+    []
+    for r in table2:
+        for s in copy h! r! index2:
+            push-through swap [ s r ]
+
+local :table1 [ [ 27 "Jonah" ] [ 18 "Alan" ] [ 28 "Glory" ] [ 18 "Popeye" ] [ 28 "Alan" ] ]
+local :table2 [ [ "Jonah" "Whales" ] [ "Jonah" "Spiders" ] [ "Alan" "Ghosts" ] [ "Alan" "Zombies" ] [ "Glory" "Buffy" ] ]
+
+for row in hashJoin table1 1 table2 0:
+    !. row