1 files changed, 24 insertions, 0 deletions
diff --git a/jstests/explain9.js b/jstests/explain9.js
new file mode 100644
index 00000000000..80cab856aa7
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+++ b/jstests/explain9.js
@@ -0,0 +1,24 @@
+// Test that limit is applied by explain when there are both in order and out of order candidate
+// plans.  SERVER-4150
+
+t = db.jstests_explain9;
+t.drop();
+
+t.ensureIndex( { a:1 } );
+
+for( i = 0; i < 10; ++i ) {
+    t.save( { a:i, b:0 } );
+}
+
+explain = t.find( { a:{ $gte:0 }, b:0 } ).sort( { a:1 } ).limit( 5 ).explain( true );
+// Five results are expected, matching the limit spec.
+assert.eq( 5, explain.n );
+explain.allPlans.forEach( function( x ) {
+                         // Five results are expected for the in order plan.
+                         if ( x.cursor == "BtreeCursor a_1" ) {
+                             assert.eq( 5, x.n );
+                         }
+                         else {
+                             assert.gte( 5, x.n );
+                         }
+                         } );