SERVER-18679 Wrong key count for reverse indexes in WT

2 files changed, 42 insertions, 1 deletions

diff --git a/jstests/noPassthroughWithMongod/validate_command.js b/jstests/noPassthroughWithMongod/validate_command.js
new file mode 100644
index 00000000000..9f92bc0bed8
--- /dev/null
+++ b/jstests/noPassthroughWithMongod/validate_command.js
@@ -0,0 +1,41 @@
+// Tests that the basic values returned from the validate command are correct
+
+(function() {
+    // Set the number of documents to insert
+    var count = 10;
+
+    function testValidate(output) {
+        assert.eq(output.nrecords, count, "validate returned an invalid count")
+        assert.eq(output.nIndexes, 3, "validate returned an invalid number of indexes")
+
+        var indexNames = output.keysPerIndex
+
+        for (var i in indexNames) {
+            if (!indexNames.hasOwnProperty(i))
+                continue;
+            assert.eq(indexNames[i], count, "validate returned an invalid number of indexes")
+        }
+    }
+
+    // Test to confirm that validate is working as expected.
+
+    // SETUP DATA
+    t = db.jstests_validate;
+    t.drop();
+
+    for(var i = 0; i < count; i++){
+        t.insert({x:i});
+    }
+
+    t.ensureIndex({x:1}, {name: "forward"})
+    t.ensureIndex({x:-1}, {name: "reverse"})
+
+
+    // TEST NORMAL VALIDATE
+    var output = t.validate()
+    testValidate(output);
+
+    // TEST FULL
+    var output = t.validate({full:true})
+    testValidate(output);
+}());
\ No newline at end of file
diff --git a/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp b/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp
index 38fd883886f..54a25954f44 100644
--- a/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp
+++ b/src/mongo/db/storage/wiredtiger/wiredtiger_index.cpp
@@ -289,7 +289,7 @@ namespace {
         TRACE_INDEX << " fullValidate";
 
         const auto requestedInfo = TRACING_ENABLED ? Cursor::kKeyAndLoc : Cursor::kJustExistance;
-        for (auto kv = cursor->seek(minKey, true, requestedInfo); kv; kv = cursor->next()) {
+        for (auto kv = cursor->seek(BSONObj(), true, requestedInfo); kv; kv = cursor->next()) {
             TRACE_INDEX << "\t" << kv->key << ' ' << kv->loc;
             count++;
         }