first commit for openGauss server

src/include/codegen/datecodegen.h

@@ -0,0 +1,41 @@
+/*
+ * Copyright (c) 2020 Huawei Technologies Co.,Ltd.
+ *
+ * openGauss is licensed under Mulan PSL v2.
+ * You can use this software according to the terms and conditions of the Mulan PSL v2.
+ * You may obtain a copy of Mulan PSL v2 at:
+ *
+ *          http://license.coscl.org.cn/MulanPSL2
+ *
+ * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+ * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+ * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+ * See the Mulan PSL v2 for more details.
+ * ---------------------------------------------------------------------------------------
+ * 
+ * datecodegen.h
+ *        Definitions of code generation for the SQL92 "date" and
+ *        "time" types.
+ * 
+ * 
+ * IDENTIFICATION
+ *        src/include/codegen/datecodegen.h
+ *
+ * ---------------------------------------------------------------------------------------
+ */
+#ifndef LLVM_DATE_H
+#define LLVM_DATE_H
+#include "codegen/gscodegen.h"
+
+namespace dorado {
+/*
+ * Comparision functions for dates
+ */
+llvm::Function* date_eq_codegen();
+llvm::Function* date_ne_codegen();
+llvm::Function* date_lt_codegen();
+llvm::Function* date_le_codegen();
+llvm::Function* date_gt_codegen();
+llvm::Function* date_ge_codegen();
+}  // namespace dorado
+#endif