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src/sql/engine/expr/ob_expr_collation.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 OCEANBASE_SQL_OB_EXPR_COLLATION_H_
+#define OCEANBASE_SQL_OB_EXPR_COLLATION_H_
+
+#include "sql/engine/expr/ob_expr_operator.h"
+namespace oceanbase {
+namespace sql {
+/// Returns the character set of the string argument.
+class ObExprCharset : public ObStringExprOperator {
+  public:
+  // ObExprCharset();
+  explicit ObExprCharset(common::ObIAllocator& alloc);
+  virtual ~ObExprCharset();
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprCharset);
+  // function members
+  private:
+  // data members
+};
+
+/// Returns the collation of the string argument.
+class ObExprCollation : public ObStringExprOperator {
+  public:
+  // ObExprCollation();
+  explicit ObExprCollation(common::ObIAllocator& alloc);
+  virtual ~ObExprCollation();
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprCollation);
+  // function members
+  private:
+  // data members
+};
+
+/// Returns the collation coercibility value of the string argument.
+/// @see ObCollationLevel
+class ObExprCoercibility : public ObExprOperator {
+  public:
+  // ObExprCoercibility();
+  explicit ObExprCoercibility(common::ObIAllocator& alloc);
+  virtual ~ObExprCoercibility();
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprCoercibility);
+  // function members
+  private:
+  // data members
+};
+
+/// change collation of the input argument
+/// used to implement COLLATE clause, e.g. C1 collate utf8_general_ci, 'abc' collate utf8_bin
+/// format: SET_COLLATION(expr, utf8_general_ci)
+class ObExprSetCollation : public ObExprOperator {
+  public:
+  // ObExprSetCollation();
+  explicit ObExprSetCollation(common::ObIAllocator& alloc);
+  virtual ~ObExprSetCollation();
+
+  virtual int calc_result_type2(
+      ObExprResType& type, ObExprResType& type1, ObExprResType& type2, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result2(
+      common::ObObj& result, const common::ObObj& obj1, const common::ObObj& obj2, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprSetCollation);
+  // function members
+  private:
+  // data members
+};
+
+/// Returns the meta used for comparison
+/// @note for debug purpose
+class ObExprCmpMeta : public ObStringExprOperator {
+  public:
+  // ObExprCmpMeta();
+  explicit ObExprCmpMeta(common::ObIAllocator& alloc);
+  virtual ~ObExprCmpMeta();
+
+  virtual int calc_result_type1(ObExprResType& type, ObExprResType& type1, common::ObExprTypeCtx& type_ctx) const;
+  virtual int calc_result1(common::ObObj& result, const common::ObObj& obj, common::ObExprCtx& expr_ctx) const;
+  virtual int cg_expr(ObExprCGCtx& expr_cg_ctx, const ObRawExpr& raw_expr, ObExpr& rt_expr) const;
+
+  private:
+  // types and constants
+  private:
+  // disallow copy
+  DISALLOW_COPY_AND_ASSIGN(ObExprCmpMeta);
+  // function members
+  private:
+  // data members
+};
+
+}  // end namespace sql
+}  // end namespace oceanbase
+
+#endif  // OCEANBASE_SQL_OB_EXPR_COLLATION_H_