From 2fe585328d6a24df310d3e60059c9c7b05b64bac Mon Sep 17 00:00:00 2001 From: Nick Kallen Date: Tue, 27 May 2008 14:19:59 -0700 Subject: performing in memory joins --- lib/arel/engines/memory/relations/operations.rb | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) (limited to 'lib/arel/engines') diff --git a/lib/arel/engines/memory/relations/operations.rb b/lib/arel/engines/memory/relations/operations.rb index 8e03aca7b1..e35fbe3234 100644 --- a/lib/arel/engines/memory/relations/operations.rb +++ b/lib/arel/engines/memory/relations/operations.rb @@ -37,4 +37,25 @@ module Arel raise NotImplementedError end end + + class Alias < Compound + def eval + unoperated_rows + end + end + + class Join < Relation + def eval + result = [] + relation1.eval.each do |row1| + relation2.eval.each do |row2| + combined_row = row1.combine(row2, self) + if predicates.all? { |p| p.eval(combined_row) } + result << combined_row + end + end + end + result + end + end end \ No newline at end of file -- cgit v1.2.3