1 files changed, 23 insertions, 0 deletions
diff --git a/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression.rb b/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression.rb
index 29290e207f2..7b1199b7795 100644
--- a/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression.rb
+++ b/storage/mroonga/vendor/groonga/lib/mrb/scripts/expression.rb
@@ -1,3 +1,8 @@
+require "scan_info"
+require "scan_info_builder"
+
+require "expression_size_estimator"
+
 module Groonga
   class Expression
     def build_scan_info(op, size)
@@ -9,5 +14,23 @@ module Groonga
         nil
       end
     end
+
+    def estimate_size(table)
+      begin
+        estimator = ExpressionSizeEstimator.new(self, table)
+        estimator.estimate
+      rescue GroongaError => groonga_error
+        context.set_groonga_error(groonga_error)
+        table.size
+      rescue => error
+        context.record_error(:unknown_error, error)
+        table.size
+      end
+    end
+
+    private
+    def context
+      @context ||= Context.instance
+    end
   end
 end