ob_any_value_checker.h

/**
 * 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_SRC_SQL_RESOLVER_DML_OB_ANY_VALUE_CHECKER_H_
#define OCEANBASE_SRC_SQL_RESOLVER_DML_OB_ANY_VALUE_CHECKER_H_
#include "sql/resolver/expr/ob_raw_expr.h"
#include "sql/resolver/dml/ob_select_stmt.h"

namespace oceanbase {
namespace sql {

class ObAnyValueChecker : public ObRawExprVisitor {
public:
  ObAnyValueChecker() : ObRawExprVisitor(), skip_expr_(nullptr), is_pass_(true)
  {}
  virtual ~ObAnyValueChecker()
  {}
  /// interface of ObRawExprVisitor
  virtual int visit(ObConstRawExpr &expr);
  virtual int visit(ObVarRawExpr &expr);
  virtual int visit(ObQueryRefRawExpr &expr);
  virtual int visit(ObColumnRefRawExpr &expr);
  virtual int visit(ObOpRawExpr &expr);
  virtual int visit(ObCaseOpRawExpr &expr);
  virtual int visit(ObAggFunRawExpr &expr);
  virtual int visit(ObSysFunRawExpr &expr);
  virtual int visit(ObSetOpRawExpr &expr);
  virtual int visit(ObAliasRefRawExpr &expr);
  virtual int visit(ObFunMatchAgainst &expr);
  virtual int visit(ObWinFunRawExpr &expr);
  virtual int visit(ObPseudoColumnRawExpr &expr);

  // set expr skip
  virtual bool skip_child(ObRawExpr &expr)
  {
    return skip_expr_ == &expr;
  }

  int check_select_stmt(const ObSelectStmt *ref_stmt);
  int check_any_value(const ObRawExpr *expr, const ObColumnRefRawExpr *undefined_column);
  bool is_pass_after_check();

private:
  void set_skip_expr(ObRawExpr *expr)
  {
    skip_expr_ = expr;
  }
  const ObColumnRefRawExpr *undefined_column_;
  ObRawExpr *skip_expr_;
  bool is_pass_;
  // disallow copy
  DISALLOW_COPY_AND_ASSIGN(ObAnyValueChecker);
};

}  // namespace sql
}  // namespace oceanbase
#endif  // OCEANBASE_SRC_SQL_RESOLVER_DML_OB_ANY_VALUE_CHECKER_H_