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js pushed a commit to annotated tag debian/0.019-1
in repository libattean-perl.

commit 93ba5b5adf9e57d1ebff13cf10dbd21a6cff9101
Author: Kjetil Kjernsmo <kje...@kjernsmo.net>
Date:   Thu Jul 28 01:53:06 2016 +0200

    Quick hack to let the cheaper left-hand-side win in HashJoin plans
---
 lib/Attean/API/QueryPlanner.pm | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Attean/API/QueryPlanner.pm b/lib/Attean/API/QueryPlanner.pm
index 876cba3..174546a 100644
--- a/lib/Attean/API/QueryPlanner.pm
+++ b/lib/Attean/API/QueryPlanner.pm
@@ -182,6 +182,7 @@ package Attean::API::SimpleCostPlanner 0.017 {
                                my $lcost               = 
$self->cost_for_plan($children[0], $model);
                                my $rcost               = 
$self->cost_for_plan($children[1], $model);
                                $cost   = ($lcost + $rcost);
+                               $cost += ($lcost > $rcost); # To let the plan 
with cheaper lhs win
                                $cost   *= 100 unless 
($plan->children_are_variable_connected);
                        } elsif ($plan->isa('Attean::Plan::Service')) {
                                my $scost       = 10;
@@ -395,6 +396,7 @@ package Attean::API::IDPJoinPlanner 0.017 {
                                        my $mult = 
$self->_penalize_joins($plan);
 #                                      warn "$mult * ($lcost + $rcost)";
                                        $cost   = $mult * ($lcost + $rcost);
+                                       $cost += ($lcost > $rcost); # To let 
the plan with cheaper lhs win
                                }
                        } elsif ($plan->isa('Attean::Plan::Service')) {
                                my $scost       = 10;

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