SERVER-14973 consolidate shard key parsing, cleanup shard key patterns

1 files changed, 7 insertions, 1 deletions

diff --git a/src/mongo/db/field_ref.h b/src/mongo/db/field_ref.h
index d35a94d284d..51b3f642985 100644
--- a/src/mongo/db/field_ref.h
+++ b/src/mongo/db/field_ref.h
@@ -89,12 +89,18 @@ namespace mongo {
         size_t commonPrefixSize( const FieldRef& other ) const;
 
         /**
-         * Returns a copy of the full dotted field in its current state (i.e., some parts may
+         * Returns a StringData of the full dotted field in its current state (i.e., some parts may
          * have been replaced since the parse() call).
          */
         StringData dottedField( size_t offsetFromStart = 0 ) const;
 
         /**
+         * Returns a StringData of parts of the dotted field from startPart to endPart in its
+         * current state (i.e., some parts may have been replaced since the parse() call).
+         */
+        StringData dottedSubstring(size_t startPart, size_t endPart) const;
+
+        /**
          * Compares the full dotted path represented by this FieldRef to other
          */
         bool equalsDottedField( const StringData& other ) const;