make group work better with nulls

1 files changed, 21 insertions, 0 deletions

diff --git a/jstests/group2.js b/jstests/group2.js
new file mode 100644
index 00000000000..7b85ddf9e5f
--- /dev/null
+++ b/jstests/group2.js
@@ -0,0 +1,21 @@
+t = db.group2;
+t.drop();
+
+t.save({a: 2});
+t.save({b: 5});
+t.save({a: 1});
+
+result = t.group({key: {a: 1},
+                  initial: {count: 0},
+                  reduce: function(obj, prev) {
+                      prev.count++;
+                  }});
+
+assert.eq(3, result.length, "A");
+assert.eq(null, result[1].a, "C");
+assert("a" in result[1], "D");
+assert.eq(1, result[2].a, "E");
+
+assert.eq(1, result[0].count, "F");
+assert.eq(1, result[1].count, "G");
+assert.eq(1, result[2].count, "H");