晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 sh-3ll

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/* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; version 2 of the License.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335  USA */

#ifndef SQL_TABLE_MAINTENANCE_H
#define SQL_TABLE_MAINTENANCE_H

/* Must be able to hold ALTER TABLE t PARTITION BY ... KEY ALGORITHM = 1 ... */
#define SQL_ADMIN_MSG_TEXT_SIZE (128 * 1024)

bool mysql_assign_to_keycache(THD* thd, TABLE_LIST* table_list,
                              const LEX_CSTRING *key_cache_name);
bool mysql_preload_keys(THD* thd, TABLE_LIST* table_list);
int reassign_keycache_tables(THD* thd, KEY_CACHE *src_cache,
                             KEY_CACHE *dst_cache);
void fill_check_table_metadata_fields(THD *thd, List<Item>* fields);
/**
  Sql_cmd_analyze_table represents the ANALYZE TABLE statement.
*/
class Sql_cmd_analyze_table : public Sql_cmd
{
public:
  /**
    Constructor, used to represent a ANALYZE TABLE statement.
  */
  Sql_cmd_analyze_table() = default;

  ~Sql_cmd_analyze_table() = default;

  bool execute(THD *thd) override;

  enum_sql_command sql_command_code() const override
  {
    return SQLCOM_ANALYZE;
  }
};



/**
  Sql_cmd_check_table represents the CHECK TABLE statement.
*/
class Sql_cmd_check_table : public Sql_cmd
{
public:
  /**
    Constructor, used to represent a CHECK TABLE statement.
  */
  Sql_cmd_check_table() = default;

  ~Sql_cmd_check_table() = default;

  bool execute(THD *thd) override;

  enum_sql_command sql_command_code() const override
  {
    return SQLCOM_CHECK;
  }
};


/**
  Sql_cmd_optimize_table represents the OPTIMIZE TABLE statement.
*/
class Sql_cmd_optimize_table : public Sql_cmd
{
public:
  /**
    Constructor, used to represent a OPTIMIZE TABLE statement.
  */
  Sql_cmd_optimize_table() = default;

  ~Sql_cmd_optimize_table() = default;

  bool execute(THD *thd) override;

  enum_sql_command sql_command_code() const override
  {
    return SQLCOM_OPTIMIZE;
  }
};



/**
  Sql_cmd_repair_table represents the REPAIR TABLE statement.
*/
class Sql_cmd_repair_table : public Sql_cmd
{
public:
  /**
    Constructor, used to represent a REPAIR TABLE statement.
  */
  Sql_cmd_repair_table() = default;

  ~Sql_cmd_repair_table() = default;

  bool execute(THD *thd) override;

  enum_sql_command sql_command_code() const override
  {
    return SQLCOM_REPAIR;
  }
};

#endif