1 files changed, 33 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression_tree/logical_operation.rb b/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression_tree/logical_operation.rb
new file mode 100644
index 00000000..e8d494f8
--- /dev/null
+++ b/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression_tree/logical_operation.rb
@@ -0,0 +1,33 @@
+module Groonga
+  module ExpressionTree
+    class LogicalOperation
+      attr_reader :operator
+      attr_reader :nodes
+      def initialize(operator, nodes)
+        @operator = operator
+        @nodes = nodes
+      end
+
+      def build(expression)
+        @nodes.each_with_index do |node, i|
+          node.build(expression)
+          expression.append_operator(@operator, 2) if i > 0
+        end
+      end
+
+      def estimate_size(table)
+        estimated_sizes = @nodes.collect do |node|
+          node.estimate_size(table)
+        end
+        case @operator
+        when Operator::AND
+          estimated_sizes.min
+        when Operator::OR
+          estimated_sizes.max
+        else
+          estimated_sizes.first
+        end
+      end
+    end
+  end
+end