From 6e1450a2a646e416aaea003eff19b7703c563bed Mon Sep 17 00:00:00 2001
From: Nick Kallen <nkallen@nick-kallens-computer-2.local>
Date: Sat, 17 May 2008 23:03:56 -0700
Subject: performance enhancements

---
 lib/arel/predicates.rb            |  2 +-
 lib/arel/primitives/attribute.rb  | 12 +++++-------
 lib/arel/relations/aggregation.rb |  2 +-
 lib/arel/relations/compound.rb    |  6 +++---
 lib/arel/relations/join.rb        | 28 +++++++++++-----------------
 lib/arel/relations/nil.rb         |  1 -
 lib/arel/relations/recursion.rb   |  4 ----
 7 files changed, 21 insertions(+), 34 deletions(-)

(limited to 'lib')

diff --git a/lib/arel/predicates.rb b/lib/arel/predicates.rb
index 93c7ed0099..3d01d5872f 100644
--- a/lib/arel/predicates.rb
+++ b/lib/arel/predicates.rb
@@ -17,7 +17,7 @@ module Arel
     end
     
     def bind(relation)
-      self.class.new(operand1.bind(relation), operand2.bind(relation))
+      self.class.new(relation[operand1] || operand1, relation[operand2] || operand2)
     end
     
     def to_sql(formatter = nil)
diff --git a/lib/arel/primitives/attribute.rb b/lib/arel/primitives/attribute.rb
index 5e769ac0eb..cb564c1587 100644
--- a/lib/arel/primitives/attribute.rb
+++ b/lib/arel/primitives/attribute.rb
@@ -38,16 +38,14 @@ module Arel
     end
 
     def original_relation
-      @original_relation ||= relation.relation_for(self)
+      original_attribute.relation
     end
     
     def original_attribute
-      @original_attribute ||= original_relation[self]
+      @original_attribute ||= history.detect { |a| !a.join? }
     end
 
-    module Transformations
-      delegate :size, :to => :history
-      
+    module Transformations      
       def self.included(klass)
         klass.send :alias_method, :eql?, :==
       end
@@ -75,8 +73,8 @@ module Arel
         @history ||= [self] + (ancestor ? ancestor.history : [])
       end
       
-      def match?(other)
-        history.last == other.history.last
+      def join?
+        relation.join?
       end
       
       def root
diff --git a/lib/arel/relations/aggregation.rb b/lib/arel/relations/aggregation.rb
index d409c34284..a6f40be786 100644
--- a/lib/arel/relations/aggregation.rb
+++ b/lib/arel/relations/aggregation.rb
@@ -15,7 +15,7 @@ module Arel
     end
   
     def attributes
-      @attributes ||= relation.attributes.collect(&:to_attribute)
+      @attributes ||= relation.attributes.collect(&:to_attribute).collect { |a| a.bind(self) }
     end
     
     def ==(other)
diff --git a/lib/arel/relations/compound.rb b/lib/arel/relations/compound.rb
index abc5838805..9921568157 100644
--- a/lib/arel/relations/compound.rb
+++ b/lib/arel/relations/compound.rb
@@ -10,9 +10,9 @@ module Arel
     def attributes
       @attributes ||= relation.attributes.collect { |a| a.bind(self) }
     end
-
-    def relation_for(attribute)
-      join? && relation.relation_for(attribute) || has_attribute?(attribute) && self
+    
+    def selects
+      @selects || relation.selects.collect { |s| s.bind(self) }
     end
   end
 end
\ No newline at end of file
diff --git a/lib/arel/relations/join.rb b/lib/arel/relations/join.rb
index abd4eae4f6..9cc9f95c81 100644
--- a/lib/arel/relations/join.rb
+++ b/lib/arel/relations/join.rb
@@ -7,14 +7,6 @@ module Arel
     def initialize(join_sql, relation1, relation2 = Nil.new, *predicates)
       @join_sql, @relation1, @relation2, @predicates = join_sql, relation1, relation2, predicates
     end
-
-    def ==(other)
-      Join       == other.class       and
-      predicates == other.predicates  and (
-        (relation1 == other.relation1 and relation2 == other.relation2) or
-        (relation2 == other.relation1 and relation1 == other.relation2)
-      )
-    end
     
     def table_sql(formatter = Sql::TableReference.new(self))
       relation1.externalize.table_sql(formatter)
@@ -25,7 +17,7 @@ module Arel
         join_sql,
         relation2.externalize.table_sql(formatter),
         ("ON" unless predicates.blank?),
-        (predicates + relation2.externalize.selects).collect { |p| p.bind(environment).to_sql(Sql::WhereClause.new(environment)) }.join(' AND ')
+        (ons + relation2.externalize.selects).collect { |p| p.bind(environment).to_sql(Sql::WhereClause.new(environment)) }.join(' AND ')
       ].compact.join(" ")
       [relation1.joins(environment), this_join, relation2.joins(environment)].compact.join(" ")
     end
@@ -39,14 +31,8 @@ module Arel
       relation1.externalize.selects
     end
     
-    def relation_for(attribute)
-      [
-        relation1.externalize.relation_for(attribute),
-        relation2.externalize.relation_for(attribute)
-      ].max do |r1, r2|
-        a1, a2 = r1 && r1[attribute], r2 && r2[attribute]
-        attribute / a1 <=> attribute / a2
-      end
+    def ons
+      @ons ||= @predicates.collect { |p| p.bind(self) }
     end
     
     # TESTME
@@ -57,6 +43,14 @@ module Arel
     def join?
       true
     end
+    
+    def ==(other)
+      Join       == other.class       and
+      predicates == other.predicates  and (
+        (relation1 == other.relation1 and relation2 == other.relation2) or
+        (relation2 == other.relation1 and relation1 == other.relation2)
+      )
+    end
   end
   
   class Relation
diff --git a/lib/arel/relations/nil.rb b/lib/arel/relations/nil.rb
index e8d4cbc481..c34fe71473 100644
--- a/lib/arel/relations/nil.rb
+++ b/lib/arel/relations/nil.rb
@@ -1,7 +1,6 @@
 module Arel
   class Nil < Relation
     def table_sql(formatter = nil); '' end
-    def relation_for(attribute); nil end
     def name; '' end
 
     def ==(other)
diff --git a/lib/arel/relations/recursion.rb b/lib/arel/relations/recursion.rb
index c2fcf1bd21..848b059507 100644
--- a/lib/arel/relations/recursion.rb
+++ b/lib/arel/relations/recursion.rb
@@ -8,10 +8,6 @@ module Arel
       def table_sql(formatter = Sql::TableReference.new(self))
         formatter.table self
       end
-      
-      def relation_for(attribute)
-        has_attribute?(attribute) && self
-      end      
     end
   end
 end
\ No newline at end of file
-- 
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