fix match for 'missing' elements

1 files changed, 12 insertions, 0 deletions

diff --git a/jstests/exists.js b/jstests/exists.js
new file mode 100644
index 00000000000..dd5a13d6dd5
--- /dev/null
+++ b/jstests/exists.js
@@ -0,0 +1,12 @@
+t = db.jstests_exists;
+t.drop();
+
+t.save( {} );
+t.save( {a:1} );
+t.save( {a:{b:1}} );
+t.save( {a:{b:{c:1}}} );
+
+assert.eq( 4, t.count() );
+assert.eq( 3, t.count( {a:{$ne:null}} ) );
+assert.eq( 2, t.count( {'a.b':{$ne:null}} ) );
+assert.eq( 1, t.count( {'a.b.c':{$ne:null}} ) );