1 files changed, 20 insertions, 0 deletions
diff --git a/jstests/core/count_hint.js b/jstests/core/count_hint.js
new file mode 100644
index 00000000000..93322d282db
--- /dev/null
+++ b/jstests/core/count_hint.js
@@ -0,0 +1,20 @@
+// test passing hint to the count cmd 
+// hints are ignored if there is no query predicate
+t = db.jstests_count_hint;
+t.drop();
+
+t.save( { i: 1 } );
+t.save( { i: 2 } );
+assert.eq( 2, t.find().count() );
+
+t.ensureIndex( { i:1 } );
+
+assert.eq( 1, t.find( { i: 1 } ).hint( "_id_" ).count(), "A" );
+assert.eq( 2, t.find().hint( "_id_" ).count(), "B" );
+assert.throws( function() { t.find( { i: 1 } ).hint( "BAD HINT" ).count(); } );
+
+// create a sparse index which should have no entries
+t.ensureIndex( { x:1 }, { sparse:true } );
+
+assert.eq( 0, t.find( { i: 1 } ).hint( "x_1" ).count(), "C" );
+assert.eq( 2, t.find().hint( "x_1" ).count(), "D" );