SERVER-13732 rewrite contained $or queries to rooted $or in the SubplanStage

This allows queries with an $or contained within an explicit or implicit $and to be answered with
more efficient plans. It also expands the use of the SubplanStage to include contained $or queries
and therefore may reduce the number of plans considered for these queries.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/mongo/db/query/query_planner_common.h b/src/mongo/db/query/query_planner_common.h
index 4fdf8f30815..d62c9c7a3ba 100644
--- a/src/mongo/db/query/query_planner_common.h
+++ b/src/mongo/db/query/query_planner_common.h
@@ -44,9 +44,9 @@ public:
      *
      * If 'out' is not NULL, sets 'out' to the first node of type 'type' encountered.
      */
-    static bool hasNode(MatchExpression* root,
+    static bool hasNode(const MatchExpression* root,
                         MatchExpression::MatchType type,
-                        MatchExpression** out = NULL) {
+                        const MatchExpression** out = NULL) {
         if (type == root->matchType()) {
             if (NULL != out) {
                 *out = root;