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src/sql/engine/expr/ob_expr_conv.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 SRC_SQL_ENGINE_EXPR_OB_EXPR__CONV_H_
+#define SRC_SQL_ENGINE_EXPR_OB_EXPR__CONV_H_
+#include "sql/engine/expr/ob_expr_operator.h"
+namespace oceanbase {
+namespace sql {
+class ObExprConv : public ObStringExprOperator {
+  public:
+  explicit ObExprConv(common::ObIAllocator& alloc);
+  virtual ~ObExprConv();
+  virtual int calc_result_type3(ObExprResType& type, ObExprResType& type1, ObExprResType& type2, ObExprResType& type3,
+      common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result3(common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2,
+      const common::ObObj& obj3, common::ObExprCtx& expr_ctx) const;
+
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int eval_conv(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& res_datum);
+
+  private:
+  static const int16_t MIN_BASE = 2;
+  static const int16_t MAX_BASE = 36;
+  static const int16_t MAX_LENGTH = 65;
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprConv);
+};
+}  // namespace sql
+}  // namespace oceanbase
+
+#endif /* SRC_SQL_ENGINE_EXPR_OB_EXPR__CONV_H_ */