Add a :cache_rows => false test for statements

Author: ajaska

spec/mysql2/statement_spec.rb

@@ -128,6 +128,14 @@
     expect(test_result['decimal_test']).to eql(123.45)
   end
 
+  it "should warn but still work if cache_rows is set to false" do
+    @client.query_options.merge!(:cache_rows => false)
+    statement = @client.prepare 'SELECT 1'
+    result = nil
+    expect { result = statement.execute.to_a }.to output(/:cache_rows is forced for prepared statements/).to_stderr
+    expect(result.length).to eq(1)
+  end
+
   context "utf8_db" do
     before(:each) do
       @client.query("DROP DATABASE IF EXISTS test_mysql2_stmt_utf8")