1 files changed, 23 insertions, 0 deletions
diff --git a/jstests/arrayfind5.js b/jstests/arrayfind5.js
new file mode 100644
index 00000000000..9ff6e2b8a5f
--- /dev/null
+++ b/jstests/arrayfind5.js
@@ -0,0 +1,23 @@
+// Test indexed elemmatch of missing field.
+
+t = db.jstests_arrayfind5;
+t.drop();
+
+function check( nullElemMatch ) {
+    assert.eq( 1, t.find( {'a.b':1} ).itcount() );
+    assert.eq( 1, t.find( {a:{$elemMatch:{b:1}}} ).itcount() );
+    assert.eq( nullElemMatch ? 1 : 0 , t.find( {'a.b':null} ).itcount() );
+    assert.eq( nullElemMatch ? 1 : 0, t.find( {a:{$elemMatch:{b:null}}} ).itcount() ); // see SERVER-3377    
+}
+
+t.save( {a:[{},{b:1}]} );
+check( true );
+t.ensureIndex( {'a.b':1} );
+check( true );
+
+t.drop();
+
+t.save( {a:[5,{b:1}]} );
+check( false );
+t.ensureIndex( {'a.b':1} );
+check( false );