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src/sql/engine/expr/ob_expr_least.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_SQL_EXPR_LEAST_H_
+#define _OB_SQL_EXPR_LEAST_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+
+namespace oceanbase {
+namespace sql {
+class ObExprBaseLeastGreatest : public ObMinMaxExprOperator {
+  public:
+  explicit ObExprBaseLeastGreatest(
+      common::ObIAllocator& alloc, ObExprOperatorType type, const char* name, int32_t param_num);
+  virtual ~ObExprBaseLeastGreatest();
+  int calc_result_typeN_oracle(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  int calc_result_typeN_mysql(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  void set_param_type(const ObExprResType& type, ObExprResType* types, int64_t param_num) const;
+  static int calc(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum, bool least);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprBaseLeastGreatest);
+};
+
+class ObExprBaseLeast : public ObExprBaseLeastGreatest {
+  public:
+  explicit ObExprBaseLeast(common::ObIAllocator& alloc, int32_t param_num, ObExprOperatorType type = T_FUN_SYS_LEAST,
+      const char* name = N_LEAST);
+  virtual ~ObExprBaseLeast();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_resultN(
+      common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num, common::ObExprCtx& expr_ctx) const;
+  static int calc(common::ObObj& result, const common::ObObj* objs_stack, int64_t param_num,
+      const ObExprResType& expected_type, common::ObExprCtx& expr_ctx);
+  virtual int cg_expr(ObExprCGCtx& op_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const override;
+  static int calc_least(const ObExpr& expr, ObEvalCtx& ctx, ObDatum& expr_datum);
+
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprBaseLeast);
+};
+
+class ObExprLeastMySQL : public ObExprBaseLeast {
+  public:
+  explicit ObExprLeastMySQL(common::ObIAllocator& alloc);
+  virtual ~ObExprLeastMySQL();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprLeastMySQL);
+};
+
+class ObExprLeastMySQLInner : public ObExprBaseLeast {
+  public:
+  explicit ObExprLeastMySQLInner(common::ObIAllocator& alloc);
+  virtual ~ObExprLeastMySQLInner();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprLeastMySQLInner);
+};
+
+class ObExprOracleLeast : public ObExprBaseLeast {
+  public:
+  explicit ObExprOracleLeast(common::ObIAllocator& alloc);
+  virtual ~ObExprOracleLeast();
+  virtual int calc_result_typeN(
+      ObExprResType& type, ObExprResType* types_stack, int64_t param_num, common::ObExprTypeCtx& type_ctx) const;
+
+  private:
+  DISALLOW_COPY_AND_ASSIGN(ObExprOracleLeast);
+};
+
+}  // namespace sql
+}  // namespace oceanbase
+#endif /* _OB_SQL_EXPR_LEAST_H_ */