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src/sql/engine/expr/ob_expr_md5.h

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+/**
+ * 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 _OB_EXPR_MD5_H_
+#define _OB_EXPR_MD5_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprMd5 : public ObStringExprOperator {
+  public:
+  ObExprMd5();
+  explicit ObExprMd5(common::ObIAllocator& alloc);
+  virtual ~ObExprMd5();
+
+  public:
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& str, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& str_obj, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int calc_md5(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  int calc_md5(common::ObObj& result, const common::ObString& str, common::ObIAllocator* allocator,
+      common::ObCollationType col_type) const;
+  static const common::ObString::obstr_size_t MD5_LENGTH = 16;
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprMd5);
+};
+} /* namespace sql */
+} /* namespace oceanbase */
+
+#endif /* _OB_EXPR_MD5_H_ */