support function crc32

src/sql/engine/expr/ob_expr_crc32.h

@@ -0,0 +1,39 @@
+/**
+ * Copyright (c) 2021 OceanBase
+ * OceanBase CE is licensed under Mulan PubL v2.
+ * You can use this software according to the terms and conditions of the Mulan PubL v2.
+ * You may obtain a copy of Mulan PubL v2 at:
+ *          http://license.coscl.org.cn/MulanPubL-2.0
+ * 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 PubL v2 for more details.
+ */
+
+#ifndef OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_
+#define OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprCrc32 : public ObFuncExprOperator {
+public:
+  explicit ObExprCrc32(common::ObIAllocator& alloc);
+  virtual ~ObExprCrc32(){};
+  static int calc_crc32(common::ObObj& obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx);
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+
+  virtual int calc_result1(common::ObObj& obj, const common::ObObj& obj1, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+  static int calc_crc32_expr(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);
+
+private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprCrc32);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif  // OCEANBASE_SQL_ENGINE_EXPR_OB_EXPR_CRC32_