migrate fts/haystack + add/del logic SERVER-8791 SERVER-9164 SERVER-9165

1 files changed, 11 insertions, 0 deletions

diff --git a/src/mongo/db/keypattern.cpp b/src/mongo/db/keypattern.cpp
index 7379c69bd2e..6c1bb6d67e6 100644
--- a/src/mongo/db/keypattern.cpp
+++ b/src/mongo/db/keypattern.cpp
@@ -40,6 +40,17 @@ namespace mongo {
         }
     }
 
+    bool KeyPattern::isIdKeyPattern(const BSONObj& pattern) {
+        BSONObjIterator i(pattern);
+        BSONElement e = i.next();
+        // _id index must have form exactly {_id : 1} or {_id : -1}.
+        // Allows an index of form {_id : "hashed"} to exist but
+        // do not consider it to be the primary _id index
+        return (0 == strcmp(e.fieldName(), "_id"))
+               && (e.numberInt() == 1 || e.numberInt() == -1)
+               && i.next().eoo();
+    }
+
     string KeyPattern::findPluginName(const BSONObj& keyPattern) {
         BSONObjIterator i(keyPattern);