From ec18db98680d31b120350ad45d5f74095125e9a5 Mon Sep 17 00:00:00 2001 From: Mathias Stearn Date: Sat, 14 Jul 2012 15:04:12 -0400 Subject: Rewrite ExpressionObject The main difference between this version and the old is that the following three $pipelines will produce the same output (SERVER-6468): {'a.b': 1} // classic inclusion {a: {b: 1} // nested inclusion {'a.b': '$a.b'} // dotted FieldPathExpression {a: {b: '$a.b'} // nested FieldPathExpression Additionally support for exclusion of fields other than _id has been removed for 2.2 (SERVER-6361) Other related bugs: SERVER-6177 better error for {a:1, 'a.b':1} SERVER-6181 support for computed _id SERVER-6184 support {'a.b': 1, a:{c:1}} in either order Remaining TODOs: Re-enable the isSimple() method See if this can be used more directly by $group to support nested fields (SERVER-6198) Disabled test for SERVER-5369 because it depends on ability to exclude arbitrary fields. --- src/mongo/db/pipeline/field_path.h | 3 +++ 1 file changed, 3 insertions(+) (limited to 'src/mongo/db/pipeline/field_path.h') diff --git a/src/mongo/db/pipeline/field_path.h b/src/mongo/db/pipeline/field_path.h index f6f59ad3295..efbda98a55d 100755 --- a/src/mongo/db/pipeline/field_path.h +++ b/src/mongo/db/pipeline/field_path.h @@ -83,6 +83,9 @@ namespace mongo { static const char prefix[]; + /** a FieldPath like this but missing the first element (useful for recursion) */ + FieldPath tail() const; + private: vector vFieldName; }; -- cgit v1.2.1