revset: disable subset optimization for parents() and children() (issue2437)

revset: disable subset optimization for parents() and children() (issue2437)

For the boolean operators, the subset optimization works by calculating
the cheaper argument first, and passing the subset to the second
argument to restrict the revision domain. This works well for filtering
predicates.

But parents() don't work like a filter: it may return revisions outside the
specified set. So, combining it with boolean operators may easily yield
incorrect results. For instance, for the following revision graph:

0 -- 1

the expression '0 and parents(1)' should evaluate as follows:

0 and parents(1) ->
0 and 0 ->
0

But since [0] is passed to parents() as a subset, we get instead:

0 and parents(1 and 0) ->
0 and parents([]) ->
0 and [] ->
[]

This also affects children(), p1() and p2(), for the same reasons.
Predicates that call these (like heads()) are also affected.

We work around this issue by ignoring the subset when propagating
the call inside those predicates.

--- a/mercurial/revset.py	Wed Oct 20 14:57:36 2010 -0500
+++ b/mercurial/revset.py	Fri Oct 15 03:30:38 2010 -0300
@@ -193,21 +193,21 @@
 def p1(repo, subset, x):
     ps = set()
     cl = repo.changelog
-    for r in getset(repo, subset, x):
+    for r in getset(repo, range(len(repo)), x):
         ps.add(cl.parentrevs(r)[0])
     return [r for r in subset if r in ps]
 
 def p2(repo, subset, x):
     ps = set()
     cl = repo.changelog
-    for r in getset(repo, subset, x):
+    for r in getset(repo, range(len(repo)), x):
         ps.add(cl.parentrevs(r)[1])
     return [r for r in subset if r in ps]
 
 def parents(repo, subset, x):
     ps = set()
     cl = repo.changelog
-    for r in getset(repo, subset, x):
+    for r in getset(repo, range(len(repo)), x):
         ps.update(cl.parentrevs(r))
     return [r for r in subset if r in ps]
 
@@ -238,7 +238,7 @@
 def children(repo, subset, x):
     cs = set()
     cl = repo.changelog
-    s = set(getset(repo, subset, x))
+    s = set(getset(repo, range(len(repo)), x))
     for r in xrange(0, len(repo)):
         for p in cl.parentrevs(r):
             if p in s:

--- a/tests/test-revset.t	Wed Oct 20 14:57:36 2010 -0500
+++ b/tests/test-revset.t	Fri Oct 15 03:30:38 2010 -0300
@@ -339,3 +339,20 @@
   0
   $ log '4::8 - 8'
   4
+
+issue2437
+
+  $ log '3 and p1(5)'
+  3
+  $ log '4 and p2(6)'
+  4
+  $ log '1 and parents(:2)'
+  1
+  $ log '2 and children(1:)'
+  2
+  $ log 'roots(all()) or roots(all())'
+  0
+  $ log 'heads(branch(é)) or heads(branch(é))'
+  9
+  $ log 'ancestors(8) and (heads(branch("-a-b-c-")) or heads(branch(é)))'
+  4