diff options
Diffstat (limited to 'src/mongo/db/matcher/expression_algo.h')
| -rw-r--r-- | src/mongo/db/matcher/expression_algo.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/mongo/db/matcher/expression_algo.h b/src/mongo/db/matcher/expression_algo.h index f43957fe80c..74300a724ca 100644 --- a/src/mongo/db/matcher/expression_algo.h +++ b/src/mongo/db/matcher/expression_algo.h @@ -54,6 +54,11 @@ using NodeTraversalFunc = std::function<void(MatchExpression*, std::string)>; bool hasExistencePredicateOnPath(const MatchExpression& expr, StringData path); /** + * Checks if 'expr' has any children which do not have renaming implemented. + */ +bool hasOnlyRenameableMatchExpressionChildren(const MatchExpression& expr); + +/** * Returns true if the documents matched by 'lhs' are a subset of the documents matched by * 'rhs', i.e. a document matched by 'lhs' must also be matched by 'rhs', and false otherwise. * @@ -183,6 +188,8 @@ splitMatchExpressionBy(std::unique_ptr<MatchExpression> expr, * to the new values of those paths. For example, suppose the original match expression is * {old: {$gt: 3}} and 'renames' contains the mapping "old" => "new". At the end, 'expr' will be * {new: {$gt: 3}}. + * + * The caller should make sure that `expr` is renamable as a whole. */ void applyRenamesToExpression(MatchExpression* expr, const StringMap<std::string>& renames); |