# HG changeset patch
# User Pierre-Yves David <pierre-yves.david@fb.com>
# Date 2014-10-17 06:14:17
# Node ID 7a42e5d4c418a9910c35d29455dbbe468d5453a3
# Parent  6f1b8b3f12fd2cb4d956bd2f3b73daab6fcc73c2

revset-children: call 'getset' on a 'fullreposet'

Calling 'baseset(repo.changelog)' builds a list for all revisions in the
repo. And we already have the lazy and efficient 'fullreposet' class
for this purpose.

This gives us the usual benefits of the fullreposet:

revset) children(tip~100)
before) wall 0.007469 comb 0.010000 user 0.010000 sys 0.000000 (best of 338)
after)  wall 0.003356 comb 0.000000 user 0.000000 sys 0.000000 (best of 755)

diff --git a/mercurial/revset.py b/mercurial/revset.py
--- a/mercurial/revset.py
+++ b/mercurial/revset.py
@@ -572,7 +572,7 @@ def children(repo, subset, x):
     """``children(set)``
     Child changesets of changesets in set.
     """
-    s = getset(repo, baseset(repo), x)
+    s = getset(repo, fullreposet(repo), x)
     cs = _children(repo, subset, s)
     return subset & cs