/**
 * 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_RESOLVER_CMD_OB_LOAD_DATA_RESOLVER_H
#define OCEANBASE_SQL_RESOLVER_CMD_OB_LOAD_DATA_RESOLVER_H
#include "lib/ob_define.h"
#include "sql/resolver/expr/ob_raw_expr_util.h"
#include "sql/resolver/cmd/ob_cmd_resolver.h"
namespace oceanbase {
namespace sql {
class ObLoadDataStmt;
struct ObDataInFileStruct;

class ObLoadDataResolver : public ObCMDResolver {
  public:
  explicit ObLoadDataResolver(ObResolverParams& params) : ObCMDResolver(params), current_scope_(T_LOAD_DATA_SCOPE)
  {}
  virtual ~ObLoadDataResolver()
  {}
  virtual int resolve(const ParseNode& parse_tree);
  int resolve_field_node(const ParseNode& node, const common::ObNameCaseMode case_mode, ObLoadDataStmt& load_stmt);
  int resolve_user_vars_node(const ParseNode& node, ObLoadDataStmt& load_stmt);
  int resolve_field_or_var_list_node(
      const ParseNode& node, const common::ObNameCaseMode case_mode, ObLoadDataStmt& load_stmt);
  int resolve_empty_field_or_var_list_node(ObLoadDataStmt& load_stmt);
  int resolve_set_clause(const ParseNode& node, const common::ObNameCaseMode case_mode, ObLoadDataStmt& load_stmt);
  int resolve_each_set_node(const ParseNode& node, const common::ObNameCaseMode case_mode, ObLoadDataStmt& load_stmt);
  int resolve_char_node(const ParseNode& node, int32_t& single_char);
  int resolve_string_node(const ParseNode& node, common::ObString& target_str);
  int resolve_field_list_node(const ParseNode& node, ObDataInFileStruct& data_struct_in_file);
  int resolve_line_list_node(const ParseNode& node, ObDataInFileStruct& data_struct_in_file);
  int resolve_sys_vars(common::ObIArray<ObVarInfo>& sys_vars);
  int resolve_default_func(ObRawExpr*& expr);
  int resolve_default_expr(ObRawExpr*& expr, ObLoadDataStmt& load_stmt, uint64_t column_id);
  int resolve_subquery_info(common::ObIArray<ObSubQueryInfo>& subquery_info);
  int build_column_ref_expr(ObQualifiedName& q_name, ObRawExpr*& col_expr);
  int resolve_column_ref_expr(common::ObIArray<ObQualifiedName>& columns, ObRawExpr*& expr);
  int check_if_table_exists(uint64_t tenant_id, const common::ObString& db_name, const common::ObString& table_name,
      bool cte_table_fisrt, uint64_t& table_id);
  int validate_stmt(ObLoadDataStmt* stmt);
  int resolve_hints(const ParseNode& node);

  private:
  enum ParameterEnum {
    ENUM_OPT_LOCAL = 0,
    ENUM_FILE_NAME,
    ENUM_DUPLICATE_ACTION,
    ENUM_TABLE_NAME,
    ENUM_OPT_CHARSET,
    ENUM_OPT_FIELD,
    ENUM_OPT_LINE,
    ENUM_OPT_IGNORE_ROWS,
    ENUM_OPT_FIELD_OR_VAR,
    ENUM_OPT_SET_FIELD,
    ENUM_OPT_HINT,
    ENUM_TOTAL_COUNT
  };
  ObStmtScope current_scope_;
  DISALLOW_COPY_AND_ASSIGN(ObLoadDataResolver);
};
}  // namespace sql
}  // namespace oceanbase
#endif