1 files changed, 49 insertions, 0 deletions
diff --git a/jstests/core/exists.js b/jstests/core/exists.js
new file mode 100644
index 00000000000..3f1e904e52f
--- /dev/null
+++ b/jstests/core/exists.js
@@ -0,0 +1,49 @@
+t = db.jstests_exists;
+t.drop();
+
+t.save( {} );
+t.save( {a:1} );
+t.save( {a:{b:1}} );
+t.save( {a:{b:{c:1}}} );
+t.save( {a:{b:{c:{d:null}}}} );
+
+function dotest( n ){
+    
+    assert.eq( 5, t.count() , n );
+    assert.eq( 1, t.count( {a:null} ) , n );
+    assert.eq( 2, t.count( {'a.b':null} ) , n );
+    assert.eq( 3, t.count( {'a.b.c':null} ) , n );
+    assert.eq( 5, t.count( {'a.b.c.d':null} ) , n );
+    
+    assert.eq( 5, t.count() , n );
+    assert.eq( 4, t.count( {a:{$ne:null}} ) , n );
+    assert.eq( 3, t.count( {'a.b':{$ne:null}} ) , n );
+    assert.eq( 2, t.count( {'a.b.c':{$ne:null}} ) , n );
+    assert.eq( 0, t.count( {'a.b.c.d':{$ne:null}} ) , n );
+    
+    assert.eq( 4, t.count( {a: {$exists:true}} ) , n );
+    assert.eq( 3, t.count( {'a.b': {$exists:true}} ) , n );
+    assert.eq( 2, t.count( {'a.b.c': {$exists:true}} ) , n );
+    assert.eq( 1, t.count( {'a.b.c.d': {$exists:true}} ) , n );
+
+    assert.eq( 1, t.count( {a: {$exists:false}} ) , n );
+    assert.eq( 2, t.count( {'a.b': {$exists:false}} ) , n );
+    assert.eq( 3, t.count( {'a.b.c': {$exists:false}} ) , n );
+    assert.eq( 4, t.count( {'a.b.c.d': {$exists:false}} ) , n );
+}
+
+dotest( "before index" )
+t.ensureIndex( { "a" : 1 } )
+t.ensureIndex( { "a.b" : 1 } )
+t.ensureIndex( { "a.b.c" : 1 } )
+t.ensureIndex( { "a.b.c.d" : 1 } )
+dotest( "after index" )
+assert.eq( 1, t.find( {a: {$exists:false}} ).hint( {a:1} ).itcount() );
+    
+t.drop();
+
+t.save( {r:[{s:1}]} );
+assert( t.findOne( {'r.s':{$exists:true}} ) );
+assert( !t.findOne( {'r.s':{$exists:false}} ) );
+assert( !t.findOne( {'r.t':{$exists:true}} ) );
+assert( t.findOne( {'r.t':{$exists:false}} ) );