Github user zuyu commented on a diff in the pull request:
https://github.com/apache/incubator-quickstep/pull/37#discussion_r67539660
--- Diff: types/DecimalLit.hpp ---
@@ -0,0 +1,131 @@
+/**
+ * Copyright 2016, Quickstep Research Group, Computer Sciences
Department,
+ * University of WisconsinâMadison.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ **/
+
+#ifndef QUICKSTEP_TYPES_DECIMAL_LIT_HPP_
+#define QUICKSTEP_TYPES_DECIMAL_LIT_HPP_
+
+#include <cstdint>
+#include <cmath>
+
+namespace quickstep {
+
+/** \addtogroup Type
+ * @{
+ */
+
+/**
+ * @brief A literal representing fixed-precision decimal.
+ **/
+struct DecimalLit {
+ typedef std::int64_t data_type;
+
+ static DecimalLit fromDouble(double value) {
+ return DecimalLit{static_cast<data_type>(value * kMaxFractionInt)};
+ }
+
+ static DecimalLit fromInt(int64_t value) {
+ return DecimalLit{static_cast<data_type>(value * kMaxFractionInt)};
+ }
+
+ data_type data_;
+
+ static constexpr std::int64_t kPrecisionWidth = 2;
+
+ static constexpr std::int64_t kMaxFractionInt = 100;
--- End diff --
Question: Do we have some `SQL` references for these constant values?
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