mariadb/sql/sql_admin.cc

/* Copyright (c) 2010, 2013, 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 02110-1301  USA */

#include "sql_class.h"                       // THD
#include "keycaches.h"                       // get_key_cache
#include "sql_base.h"                        // Open_table_context
#include "lock.h"                            // MYSQL_OPEN_*
#include "sql_handler.h"                     // mysql_ha_rm_tables
#include "partition_element.h"               // PART_ADMIN
#include "sql_partition.h"                   // set_part_state
#include "transaction.h"                     // trans_rollback_stmt
#include "sql_view.h"                        // view_checksum
#include "sql_table.h"                       // mysql_recreate_table
#include "debug_sync.h"                      // DEBUG_SYNC
#include "sql_acl.h"                         // *_ACL
#include "sp.h"                              // Sroutine_hash_entry
#include "sql_parse.h"                       // check_table_access
#include "sql_admin.h"

static int send_check_errmsg(THD *thd, TABLE_LIST* table,
			     const char* operator_name, const char* errmsg)

{
  Protocol *protocol= thd->protocol;
  protocol->prepare_for_resend();
  protocol->store(table->alias, system_charset_info);
  protocol->store((char*) operator_name, system_charset_info);
  protocol->store(STRING_WITH_LEN("error"), system_charset_info);
  protocol->store(errmsg, system_charset_info);
  thd->clear_error();
  if (protocol->write())
    return -1;
  return 1;
}


static int prepare_for_repair(THD *thd, TABLE_LIST *table_list,
			      HA_CHECK_OPT *check_opt)
{
  int error= 0;
  TABLE tmp_table, *table;
  TABLE_SHARE *share;
  bool has_mdl_lock= FALSE;
  char from[FN_REFLEN],tmp[FN_REFLEN+32];
  const char **ext;
  MY_STAT stat_info;
  Open_table_context ot_ctx(thd, (MYSQL_OPEN_IGNORE_FLUSH |
                                  MYSQL_OPEN_HAS_MDL_LOCK |
                                  MYSQL_LOCK_IGNORE_TIMEOUT));
  DBUG_ENTER("prepare_for_repair");

  if (!(check_opt->sql_flags & TT_USEFRM))
    DBUG_RETURN(0);

  if (!(table= table_list->table))
  {
    char key[MAX_DBKEY_LENGTH];
    uint key_length;
    /*
      If the table didn't exist, we have a shared metadata lock
      on it that is left from mysql_admin_table()'s attempt to 
      open it. Release the shared metadata lock before trying to
      acquire the exclusive lock to satisfy MDL asserts and avoid
      deadlocks.
    */
    thd->mdl_context.release_transactional_locks();
    /*
      Attempt to do full-blown table open in mysql_admin_table() has failed.
      Let us try to open at least a .FRM for this table.
    */
    my_hash_value_type hash_value;

    key_length= create_table_def_key(thd, key, table_list, 0);
    table_list->mdl_request.init(MDL_key::TABLE,
                                 table_list->db, table_list->table_name,
                                 MDL_EXCLUSIVE, MDL_TRANSACTION);

    if (lock_table_names(thd, table_list, table_list->next_global,
                         thd->variables.lock_wait_timeout,
                         MYSQL_OPEN_SKIP_TEMPORARY))
      DBUG_RETURN(0);
    has_mdl_lock= TRUE;

    hash_value= my_calc_hash(&table_def_cache, (uchar*) key, key_length);
    mysql_mutex_lock(&LOCK_open);
    share= get_table_share(thd, table_list, key, key_length, 0,
                           &error, hash_value);
    mysql_mutex_unlock(&LOCK_open);
    if (share == NULL)
      DBUG_RETURN(0);				// Can't open frm file

    if (open_table_from_share(thd, share, "", 0, 0, 0, &tmp_table, FALSE))
    {
      mysql_mutex_lock(&LOCK_open);
      release_table_share(share);
      mysql_mutex_unlock(&LOCK_open);
      DBUG_RETURN(0);                           // Out of memory
    }
    table= &tmp_table;
  }

  /*
    REPAIR TABLE ... USE_FRM for temporary tables makes little sense.
  */
  if (table->s->tmp_table)
  {
    error= send_check_errmsg(thd, table_list, "repair",
			     "Cannot repair temporary table from .frm file");
    goto end;
  }

  /*
    User gave us USE_FRM which means that the header in the index file is
    trashed.
    In this case we will try to fix the table the following way:
    - Rename the data file to a temporary name
    - Truncate the table
    - Replace the new data file with the old one
    - Run a normal repair using the new index file and the old data file
  */

  if (table->s->frm_version != FRM_VER_TRUE_VARCHAR)
  {
    error= send_check_errmsg(thd, table_list, "repair",
                             "Failed repairing incompatible .frm file");
    goto end;
  }

  /*
    Check if this is a table type that stores index and data separately,
    like ISAM or MyISAM. We assume fixed order of engine file name
    extentions array. First element of engine file name extentions array
    is meta/index file extention. Second element - data file extention. 
  */
  ext= table->file->bas_ext();
  if (!ext[0] || !ext[1])
    goto end;					// No data file

  /* A MERGE table must not come here. */
  DBUG_ASSERT(table->file->ht->db_type != DB_TYPE_MRG_MYISAM);

  // Name of data file
  strxmov(from, table->s->normalized_path.str, ext[1], NullS);
  if (!mysql_file_stat(key_file_misc, from, &stat_info, MYF(0)))
    goto end;				// Can't use USE_FRM flag

  my_snprintf(tmp, sizeof(tmp), "%s-%lx_%lx",
	      from, current_pid, thd->thread_id);

  if (table_list->table)
  {
    /*
      Table was successfully open in mysql_admin_table(). Now we need
      to close it, but leave it protected by exclusive metadata lock.
    */
    if (wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN))
      goto end;
    close_all_tables_for_name(thd, table_list->table->s, FALSE);
    table_list->table= 0;
  }
  /*
    After this point we have an exclusive metadata lock on our table
    in both cases when table was successfully open in mysql_admin_table()
    and when it was open in prepare_for_repair().
  */

  if (my_rename(from, tmp, MYF(MY_WME)))
  {
    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed renaming data file");
    goto end;
  }
  if (dd_recreate_table(thd, table_list->db, table_list->table_name))
  {
    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed generating table from .frm file");
    goto end;
  }
  /*
    'FALSE' for 'using_transactions' means don't postpone
    invalidation till the end of a transaction, but do it
    immediately.
  */
  query_cache_invalidate3(thd, table_list, FALSE);
  if (mysql_file_rename(key_file_misc, tmp, from, MYF(MY_WME)))
  {
    error= send_check_errmsg(thd, table_list, "repair",
			     "Failed restoring .MYD file");
    goto end;
  }

  if (thd->locked_tables_list.reopen_tables(thd))
    goto end;

  /*
    Now we should be able to open the partially repaired table
    to finish the repair in the handler later on.
  */
  if (open_table(thd, table_list, thd->mem_root, &ot_ctx))
  {
    error= send_check_errmsg(thd, table_list, "repair",
                             "Failed to open partially repaired table");
    goto end;
  }

end:
  thd->locked_tables_list.unlink_all_closed_tables(thd, NULL, 0);
  if (table == &tmp_table)
  {
    mysql_mutex_lock(&LOCK_open);
    closefrm(table, 1);				// Free allocated memory
    mysql_mutex_unlock(&LOCK_open);
  }
  /* In case of a temporary table there will be no metadata lock. */
  if (error && has_mdl_lock)
    thd->mdl_context.release_transactional_locks();

  DBUG_RETURN(error);
}


/**
  Check if a given error is something that could occur during
  open_and_lock_tables() that does not indicate table corruption.

  @param  sql_errno  Error number to check.

  @retval TRUE       Error does not indicate table corruption.
  @retval FALSE      Error could indicate table corruption.
*/

static inline bool table_not_corrupt_error(uint sql_errno)
{
  return (sql_errno == ER_NO_SUCH_TABLE ||
          sql_errno == ER_FILE_NOT_FOUND ||
          sql_errno == ER_LOCK_WAIT_TIMEOUT ||
          sql_errno == ER_LOCK_DEADLOCK ||
          sql_errno == ER_CANT_LOCK_LOG_TABLE ||
          sql_errno == ER_OPEN_AS_READONLY);
}


/*
  RETURN VALUES
    FALSE Message sent to net (admin operation went ok)
    TRUE  Message should be sent by caller 
          (admin operation or network communication failed)
*/
static bool mysql_admin_table(THD* thd, TABLE_LIST* tables,
                              HA_CHECK_OPT* check_opt,
                              const char *operator_name,
                              thr_lock_type lock_type,
                              bool open_for_modify,
                              bool repair_table_use_frm,
                              uint extra_open_options,
                              int (*prepare_func)(THD *, TABLE_LIST *,
                                                  HA_CHECK_OPT *),
                              int (handler::*operator_func)(THD *,
                                                            HA_CHECK_OPT *),
                              int (view_operator_func)(THD *, TABLE_LIST*))
{
  TABLE_LIST *table;
  SELECT_LEX *select= &thd->lex->select_lex;
  List<Item> field_list;
  Item *item;
  Protocol *protocol= thd->protocol;
  LEX *lex= thd->lex;
  int result_code;
  DBUG_ENTER("mysql_admin_table");

  field_list.push_back(item = new Item_empty_string("Table", NAME_CHAR_LEN*2));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Op", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_type", 10));
  item->maybe_null = 1;
  field_list.push_back(item = new Item_empty_string("Msg_text",
                                                    SQL_ADMIN_MSG_TEXT_SIZE));
  item->maybe_null = 1;
  if (protocol->send_result_set_metadata(&field_list,
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
    DBUG_RETURN(TRUE);

  mysql_ha_rm_tables(thd, tables);

  for (table= tables; table; table= table->next_local)
  {
    char table_name[NAME_LEN*2+2];
    char* db = table->db;
    bool fatal_error=0;
    bool open_error;

    DBUG_PRINT("admin", ("table: '%s'.'%s'", table->db, table->table_name));
    DBUG_PRINT("admin", ("extra_open_options: %u", extra_open_options));
    strxmov(table_name, db, ".", table->table_name, NullS);
    thd->open_options|= extra_open_options;
    table->lock_type= lock_type;
    /*
      To make code safe for re-execution we need to reset type of MDL
      request as code below may change it.
      To allow concurrent execution of read-only operations we acquire
      weak metadata lock for them.
    */
    table->mdl_request.set_type((lock_type >= TL_WRITE_ALLOW_WRITE) ?
                                MDL_SHARED_NO_READ_WRITE : MDL_SHARED_READ);
    /* open only one table from local list of command */
    {
      TABLE_LIST *save_next_global, *save_next_local;
      save_next_global= table->next_global;
      table->next_global= 0;
      save_next_local= table->next_local;
      table->next_local= 0;
      select->table_list.first= table;
      /*
        Time zone tables and SP tables can be add to lex->query_tables list,
        so it have to be prepared.
        TODO: Investigate if we can put extra tables into argument instead of
        using lex->query_tables
      */
      lex->query_tables= table;
      lex->query_tables_last= &table->next_global;
      lex->query_tables_own_last= 0;

      if (view_operator_func == NULL)
        table->required_type=FRMTYPE_TABLE;

      if (!thd->locked_tables_mode && repair_table_use_frm)
      {
        /*
          If we're not under LOCK TABLES and we're executing REPAIR TABLE
          USE_FRM, we need to ignore errors from open_and_lock_tables().
          REPAIR TABLE USE_FRM is a heavy weapon used when a table is
          critically damaged, so open_and_lock_tables() will most likely
          report errors. Those errors are not interesting for the user
          because it's already known that the table is badly damaged.
        */

        Warning_info wi(thd->query_id, false);
        Warning_info *wi_saved= thd->warning_info;

        thd->warning_info= &wi;

        open_error= open_and_lock_tables(thd, table, TRUE, 0);

        thd->warning_info= wi_saved;
      }
      else
      {
        /*
          It's assumed that even if it is REPAIR TABLE USE_FRM, the table
          can be opened if we're under LOCK TABLES (otherwise LOCK TABLES
          would fail). Thus, the only errors we could have from
          open_and_lock_tables() are logical ones, like incorrect locking
          mode. It does make sense for the user to see such errors.
        */

        open_error= open_and_lock_tables(thd, table, TRUE, 0);
      }

      table->next_global= save_next_global;
      table->next_local= save_next_local;
      thd->open_options&= ~extra_open_options;

      /*
        If open_and_lock_tables() failed, close_thread_tables() will close
        the table and table->table can therefore be invalid.
      */
      if (open_error)
        table->table= NULL;

      /*
        Under locked tables, we know that the table can be opened,
        so any errors opening the table are logical errors.
        In these cases it does not make sense to try to repair.
      */
      if (open_error && thd->locked_tables_mode)
      {
        result_code= HA_ADMIN_FAILED;
        goto send_result;
      }
#ifdef WITH_PARTITION_STORAGE_ENGINE
      if (table->table)
      {
        /*
          Set up which partitions that should be processed
          if ALTER TABLE t ANALYZE/CHECK/OPTIMIZE/REPAIR PARTITION ..
          CACHE INDEX/LOAD INDEX for specified partitions
        */
        Alter_info *alter_info= &lex->alter_info;

        if (alter_info->flags & ALTER_ADMIN_PARTITION)
        {
          if (!table->table->part_info)
          {
            my_error(ER_PARTITION_MGMT_ON_NONPARTITIONED, MYF(0));
            DBUG_RETURN(TRUE);
          }
          if (set_part_state(alter_info, table->table->part_info, PART_ADMIN))
          {
            char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE];
            size_t length;
            DBUG_PRINT("admin", ("sending non existent partition error"));
            protocol->prepare_for_resend();
            protocol->store(table_name, system_charset_info);
            protocol->store(operator_name, system_charset_info);
            protocol->store(STRING_WITH_LEN("error"), system_charset_info);
            length= my_snprintf(buff, sizeof(buff),
                                ER(ER_DROP_PARTITION_NON_EXISTENT),
                                table_name);
            protocol->store(buff, length, system_charset_info);
            if(protocol->write())
              goto err;
            my_eof(thd);
            goto err;
          }
        }
      }
#endif
    }
    DBUG_PRINT("admin", ("table: 0x%lx", (long) table->table));

    if (prepare_func)
    {
      DBUG_PRINT("admin", ("calling prepare_func"));
      switch ((*prepare_func)(thd, table, check_opt)) {
      case  1:           // error, message written to net
        trans_rollback_stmt(thd);
        trans_rollback(thd);
        close_thread_tables(thd);
        thd->mdl_context.release_transactional_locks();
        DBUG_PRINT("admin", ("simple error, admin next table"));
        continue;
      case -1:           // error, message could be written to net
        /* purecov: begin inspected */
        DBUG_PRINT("admin", ("severe error, stop"));
        goto err;
        /* purecov: end */
      default:           // should be 0 otherwise
        DBUG_PRINT("admin", ("prepare_func succeeded"));
        ;
      }
    }

    /*
      CHECK TABLE command is only command where VIEW allowed here and this
      command use only temporary teble method for VIEWs resolving => there
      can't be VIEW tree substitition of join view => if opening table
      succeed then table->table will have real TABLE pointer as value (in
      case of join view substitution table->table can be 0, but here it is
      impossible)
    */
    if (!table->table)
    {
      DBUG_PRINT("admin", ("open table failed"));
      if (thd->warning_info->is_empty())
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                     ER_CHECK_NO_SUCH_TABLE, ER(ER_CHECK_NO_SUCH_TABLE));
      /* if it was a view will check md5 sum */
      if (table->view &&
          view_checksum(thd, table) == HA_ADMIN_WRONG_CHECKSUM)
        push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                     ER_VIEW_CHECKSUM, ER(ER_VIEW_CHECKSUM));
      if (thd->stmt_da->is_error() &&
          table_not_corrupt_error(thd->stmt_da->sql_errno()))
        result_code= HA_ADMIN_FAILED;
      else
        /* Default failure code is corrupt table */
        result_code= HA_ADMIN_CORRUPT;
      goto send_result;
    }

    if (table->view)
    {
      DBUG_PRINT("admin", ("calling view_operator_func"));
      result_code= (*view_operator_func)(thd, table);
      goto send_result;
    }

    if (table->schema_table)
    {
      result_code= HA_ADMIN_NOT_IMPLEMENTED;
      goto send_result;
    }

    if ((table->table->db_stat & HA_READ_ONLY) && open_for_modify)
    {
      /* purecov: begin inspected */
      char buff[FN_REFLEN + MYSQL_ERRMSG_SIZE];
      size_t length;
      enum_sql_command save_sql_command= lex->sql_command;
      DBUG_PRINT("admin", ("sending error message"));
      protocol->prepare_for_resend();
      protocol->store(table_name, system_charset_info);
      protocol->store(operator_name, system_charset_info);
      protocol->store(STRING_WITH_LEN("error"), system_charset_info);
      length= my_snprintf(buff, sizeof(buff), ER(ER_OPEN_AS_READONLY),
                          table_name);
      protocol->store(buff, length, system_charset_info);
      trans_commit_stmt(thd);
      trans_commit(thd);
      close_thread_tables(thd);
      thd->mdl_context.release_transactional_locks();
      lex->reset_query_tables_list(FALSE);
      /*
        Restore Query_tables_list::sql_command value to make statement
        safe for re-execution.
      */
      lex->sql_command= save_sql_command;
      table->table=0;				// For query cache
      if (protocol->write())
	goto err;
      thd->stmt_da->reset_diagnostics_area();
      continue;
      /* purecov: end */
    }

    /*
      Close all instances of the table to allow MyISAM "repair"
      to rename files.
      @todo: This code does not close all instances of the table.
      It only closes instances in other connections, but if this
      connection has LOCK TABLE t1 a READ, t1 b WRITE,
      both t1 instances will be kept open.
      There is no need to execute this branch for InnoDB, which does
      repair by recreate. There is no need to do it for OPTIMIZE,
      which doesn't move files around.
      Hence, this code should be moved to prepare_for_repair(),
      and executed only for MyISAM engine.
    */
    if (lock_type == TL_WRITE && !table->table->s->tmp_table)
    {
      if (wait_while_table_is_used(thd, table->table,
                                   HA_EXTRA_PREPARE_FOR_RENAME))
        goto err;
      DEBUG_SYNC(thd, "after_admin_flush");
      /* Flush entries in the query cache involving this table. */
      query_cache_invalidate3(thd, table->table, 0);
      /*
        XXX: hack: switch off open_for_modify to skip the
        flush that is made later in the execution flow. 
      */
      open_for_modify= 0;
    }

    if (table->table->s->crashed && operator_func == &handler::ha_check)
    {
      /* purecov: begin inspected */
      DBUG_PRINT("admin", ("sending crashed warning"));
      protocol->prepare_for_resend();
      protocol->store(table_name, system_charset_info);
      protocol->store(operator_name, system_charset_info);
      protocol->store(STRING_WITH_LEN("warning"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Table is marked as crashed"),
                      system_charset_info);
      if (protocol->write())
        goto err;
      /* purecov: end */
    }

    if (operator_func == &handler::ha_repair &&
        !(check_opt->sql_flags & TT_USEFRM))
    {
      if ((table->table->file->check_old_types() == HA_ADMIN_NEEDS_ALTER) ||
          (table->table->file->ha_check_for_upgrade(check_opt) ==
           HA_ADMIN_NEEDS_ALTER))
      {
        DBUG_PRINT("admin", ("recreating table"));
        trans_rollback_stmt(thd);
        trans_rollback(thd);
        close_thread_tables(thd);
        thd->mdl_context.release_transactional_locks();
        tmp_disable_binlog(thd); // binlogging is done by caller if wanted
        result_code= mysql_recreate_table(thd, table);
        reenable_binlog(thd);
        /*
          mysql_recreate_table() can push OK or ERROR.
          Clear 'OK' status. If there is an error, keep it:
          we will store the error message in a result set row 
          and then clear.
        */
        if (thd->stmt_da->is_ok())
          thd->stmt_da->reset_diagnostics_area();
        table->table= NULL;
        result_code= result_code ? HA_ADMIN_FAILED : HA_ADMIN_OK;
        goto send_result;
      }
    }

    DBUG_PRINT("admin", ("calling operator_func '%s'", operator_name));
    result_code = (table->table->file->*operator_func)(thd, check_opt);
    DBUG_PRINT("admin", ("operator_func returned: %d", result_code));

send_result:

    lex->cleanup_after_one_table_open();
    thd->clear_error();  // these errors shouldn't get client
    {
      List_iterator_fast<MYSQL_ERROR> it(thd->warning_info->warn_list());
      MYSQL_ERROR *err;
      while ((err= it++))
      {
        protocol->prepare_for_resend();
        protocol->store(table_name, system_charset_info);
        protocol->store((char*) operator_name, system_charset_info);
        protocol->store(warning_level_names[err->get_level()].str,
                        warning_level_names[err->get_level()].length,
                        system_charset_info);
        protocol->store(err->get_message_text(), system_charset_info);
        if (protocol->write())
          goto err;
      }
      thd->warning_info->clear_warning_info(thd->query_id);
    }
    protocol->prepare_for_resend();
    protocol->store(table_name, system_charset_info);
    protocol->store(operator_name, system_charset_info);

send_result_message:

    DBUG_PRINT("info", ("result_code: %d", result_code));
    switch (result_code) {
    case HA_ADMIN_NOT_IMPLEMENTED:
      {
       char buf[MYSQL_ERRMSG_SIZE];
       size_t length=my_snprintf(buf, sizeof(buf),
				ER(ER_CHECK_NOT_IMPLEMENTED), operator_name);
	protocol->store(STRING_WITH_LEN("note"), system_charset_info);
	protocol->store(buf, length, system_charset_info);
      }
      break;

    case HA_ADMIN_NOT_BASE_TABLE:
      {
        char buf[MYSQL_ERRMSG_SIZE];
        size_t length= my_snprintf(buf, sizeof(buf),
                                 ER(ER_BAD_TABLE_ERROR), table_name);
        protocol->store(STRING_WITH_LEN("note"), system_charset_info);
        protocol->store(buf, length, system_charset_info);
      }
      break;

    case HA_ADMIN_OK:
      protocol->store(STRING_WITH_LEN("status"), system_charset_info);
      protocol->store(STRING_WITH_LEN("OK"), system_charset_info);
      break;

    case HA_ADMIN_FAILED:
      protocol->store(STRING_WITH_LEN("status"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Operation failed"),
                      system_charset_info);
      break;

    case HA_ADMIN_REJECT:
      protocol->store(STRING_WITH_LEN("status"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Operation need committed state"),
                      system_charset_info);
      open_for_modify= FALSE;
      break;

    case HA_ADMIN_ALREADY_DONE:
      protocol->store(STRING_WITH_LEN("status"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Table is already up to date"),
                      system_charset_info);
      break;

    case HA_ADMIN_CORRUPT:
      protocol->store(STRING_WITH_LEN("error"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Corrupt"), system_charset_info);
      fatal_error=1;
      break;

    case HA_ADMIN_INVALID:
      protocol->store(STRING_WITH_LEN("error"), system_charset_info);
      protocol->store(STRING_WITH_LEN("Invalid argument"),
                      system_charset_info);
      break;

    case HA_ADMIN_TRY_ALTER:
    {
      uint save_flags;
      Alter_info *alter_info= &lex->alter_info;

      /* Store the original value of alter_info->flags */
      save_flags= alter_info->flags;
      /*
        This is currently used only by InnoDB. ha_innobase::optimize() answers
        "try with alter", so here we close the table, do an ALTER TABLE,
        reopen the table and do ha_innobase::analyze() on it.
        We have to end the row, so analyze could return more rows.
      */
      trans_commit_stmt(thd);
      trans_commit(thd);
      close_thread_tables(thd);
      thd->mdl_context.release_transactional_locks();
      DEBUG_SYNC(thd, "ha_admin_try_alter");
      protocol->store(STRING_WITH_LEN("note"), system_charset_info);
      if(alter_info->flags & ALTER_ADMIN_PARTITION)
      {
        protocol->store(STRING_WITH_LEN(
        "Table does not support optimize on partitions. All partitions "
        "will be rebuilt and analyzed."),system_charset_info);
      }
      else
      {
        protocol->store(STRING_WITH_LEN(
        "Table does not support optimize, doing recreate + analyze instead"),
        system_charset_info);
      }
     if (protocol->write())
        goto err;
      DBUG_PRINT("info", ("HA_ADMIN_TRY_ALTER, trying analyze..."));
      TABLE_LIST *save_next_local= table->next_local,
                 *save_next_global= table->next_global;
      table->next_local= table->next_global= 0;
      tmp_disable_binlog(thd); // binlogging is done by caller if wanted
      result_code= mysql_recreate_table(thd, table);
      reenable_binlog(thd);
      /*
        mysql_recreate_table() can push OK or ERROR.
        Clear 'OK' status. If there is an error, keep it:
        we will store the error message in a result set row 
        and then clear.
      */
      if (thd->stmt_da->is_ok())
        thd->stmt_da->reset_diagnostics_area();
      trans_commit_stmt(thd);
      trans_commit(thd);
      close_thread_tables(thd);
      thd->mdl_context.release_transactional_locks();
      table->table= NULL;
      if (!result_code) // recreation went ok
      {
        /* Clear the ticket released above. */
        table->mdl_request.ticket= NULL;
        DEBUG_SYNC(thd, "ha_admin_open_ltable");
        table->mdl_request.set_type(MDL_SHARED_WRITE);
        /*
          Reset the ALTER_ADMIN_PARTITION bit in alter_info->flags
          to force analyze on all partitions.
        */
        alter_info->flags &= ~(ALTER_ADMIN_PARTITION);
        if ((table->table= open_ltable(thd, table, lock_type, 0)))
        {
          result_code= table->table->file->ha_analyze(thd, check_opt);
          if (result_code == HA_ADMIN_ALREADY_DONE)
            result_code= HA_ADMIN_OK;
          else if (result_code)  // analyze failed
            table->table->file->print_error(result_code, MYF(0));
        }
        else
          result_code= -1; // open failed
        alter_info->flags= save_flags;
      }
      /* Start a new row for the final status row */
      protocol->prepare_for_resend();
      protocol->store(table_name, system_charset_info);
      protocol->store(operator_name, system_charset_info);
      if (result_code) // either mysql_recreate_table or analyze failed
      {
        DBUG_ASSERT(thd->is_error() || thd->killed);
        if (thd->is_error())
        {
          const char *err_msg= thd->stmt_da->message();
          if (!thd->vio_ok())
          {
            sql_print_error("%s", err_msg);
          }
          else
          {
            /* Hijack the row already in-progress. */
            protocol->store(STRING_WITH_LEN("error"), system_charset_info);
            protocol->store(err_msg, system_charset_info);
            if (protocol->write())
              goto err;
            /* Start off another row for HA_ADMIN_FAILED */
            protocol->prepare_for_resend();
            protocol->store(table_name, system_charset_info);
            protocol->store(operator_name, system_charset_info);
          }
          thd->clear_error();
        }
      }
      result_code= result_code ? HA_ADMIN_FAILED : HA_ADMIN_OK;
      table->next_local= save_next_local;
      table->next_global= save_next_global;
      goto send_result_message;
    }
    case HA_ADMIN_WRONG_CHECKSUM:
    {
      protocol->store(STRING_WITH_LEN("note"), system_charset_info);
      protocol->store(ER(ER_VIEW_CHECKSUM), strlen(ER(ER_VIEW_CHECKSUM)),
                      system_charset_info);
      break;
    }

    case HA_ADMIN_NEEDS_UPGRADE:
    case HA_ADMIN_NEEDS_ALTER:
    {
      char buf[MYSQL_ERRMSG_SIZE];
      size_t length;

      protocol->store(STRING_WITH_LEN("error"), system_charset_info);
      if (table->table->file->ha_table_flags() & HA_CAN_REPAIR)
        length= my_snprintf(buf, sizeof(buf), ER(ER_TABLE_NEEDS_UPGRADE),
                            table->table_name);
      else
        length= my_snprintf(buf, sizeof(buf), ER(ER_TABLE_NEEDS_REBUILD),
                            table->table_name);
      protocol->store(buf, length, system_charset_info);
      fatal_error=1;
      break;
    }

    default:				// Probably HA_ADMIN_INTERNAL_ERROR
      {
        char buf[MYSQL_ERRMSG_SIZE];
        size_t length=my_snprintf(buf, sizeof(buf),
                                "Unknown - internal error %d during operation",
                                result_code);
        protocol->store(STRING_WITH_LEN("error"), system_charset_info);
        protocol->store(buf, length, system_charset_info);
        fatal_error=1;
        break;
      }
    }
    if (table->table)
    {
      if (table->table->s->tmp_table)
      {
        /*
          If the table was not opened successfully, do not try to get
          status information. (Bug#47633)
        */
        if (open_for_modify && !open_error)
          table->table->file->info(HA_STATUS_CONST);
      }
      else if (open_for_modify || fatal_error)
      {
        tdc_remove_table(thd, TDC_RT_REMOVE_UNUSED,
                         table->db, table->table_name, FALSE);
        /*
          May be something modified. Consequently, we have to
          invalidate the query cache.
        */
        table->table= 0;                        // For query cache
        query_cache_invalidate3(thd, table, 0);
      }
    }
    /* Error path, a admin command failed. */
    if (thd->transaction_rollback_request)
    {
      /*
        Unlikely, but transaction rollback was requested by one of storage
        engines (e.g. due to deadlock). Perform it.
      */
      if (trans_rollback_stmt(thd) || trans_rollback_implicit(thd))
        goto err;
    }
    else
    {
      if (trans_commit_stmt(thd) || trans_commit_implicit(thd))
        goto err;
    }
    close_thread_tables(thd);
    thd->mdl_context.release_transactional_locks();

    /*
      If it is CHECK TABLE v1, v2, v3, and v1, v2, v3 are views, we will run
      separate open_tables() for each CHECK TABLE argument.
      Right now we do not have a separate method to reset the prelocking
      state in the lex to the state after parsing, so each open will pollute
      this state: add elements to lex->srotuines_list, TABLE_LISTs to
      lex->query_tables. Below is a lame attempt to recover from this
      pollution.
      @todo: have a method to reset a prelocking context, or use separate
      contexts for each open.
    */
    for (Sroutine_hash_entry *rt=
           (Sroutine_hash_entry*)thd->lex->sroutines_list.first;
         rt; rt= rt->next)
      rt->mdl_request.ticket= NULL;

    if (protocol->write())
      goto err;
  }

  my_eof(thd);
  DBUG_RETURN(FALSE);

err:
  /* Make sure this table instance is not reused after the failure. */
  if (table && table->table)
    table->table->m_needs_reopen= true;
  trans_rollback_stmt(thd);
  trans_rollback(thd);
  close_thread_tables(thd);			// Shouldn't be needed
  thd->mdl_context.release_transactional_locks();
  if (table)
    table->table=0;
  DBUG_RETURN(TRUE);
}


/*
  Assigned specified indexes for a table into key cache

  SYNOPSIS
    mysql_assign_to_keycache()
    thd		Thread object
    tables	Table list (one table only)

  RETURN VALUES
   FALSE ok
   TRUE  error
*/

bool mysql_assign_to_keycache(THD* thd, TABLE_LIST* tables,
			     LEX_STRING *key_cache_name)
{
  HA_CHECK_OPT check_opt;
  KEY_CACHE *key_cache;
  DBUG_ENTER("mysql_assign_to_keycache");

  check_opt.init();
  mysql_mutex_lock(&LOCK_global_system_variables);
  if (!(key_cache= get_key_cache(key_cache_name)))
  {
    mysql_mutex_unlock(&LOCK_global_system_variables);
    my_error(ER_UNKNOWN_KEY_CACHE, MYF(0), key_cache_name->str);
    DBUG_RETURN(TRUE);
  }
  mysql_mutex_unlock(&LOCK_global_system_variables);
  if (!key_cache->key_cache_inited)
  {
    my_error(ER_UNKNOWN_KEY_CACHE, MYF(0), key_cache_name->str);
    DBUG_RETURN(true);
  }
  check_opt.key_cache= key_cache;
  DBUG_RETURN(mysql_admin_table(thd, tables, &check_opt,
				"assign_to_keycache", TL_READ_NO_INSERT, 0, 0,
				0, 0, &handler::assign_to_keycache, 0));
}


/*
  Preload specified indexes for a table into key cache

  SYNOPSIS
    mysql_preload_keys()
    thd		Thread object
    tables	Table list (one table only)

  RETURN VALUES
    FALSE ok
    TRUE  error
*/

bool mysql_preload_keys(THD* thd, TABLE_LIST* tables)
{
  DBUG_ENTER("mysql_preload_keys");
  /*
    We cannot allow concurrent inserts. The storage engine reads
    directly from the index file, bypassing the cache. It could read
    outdated information if parallel inserts into cache blocks happen.
  */
  DBUG_RETURN(mysql_admin_table(thd, tables, 0,
				"preload_keys", TL_READ_NO_INSERT, 0, 0, 0, 0,
				&handler::preload_keys, 0));
}


bool Analyze_table_statement::execute(THD *thd)
{
  TABLE_LIST *first_table= m_lex->select_lex.table_list.first;
  bool res= TRUE;
  thr_lock_type lock_type = TL_READ_NO_INSERT;
  DBUG_ENTER("Analyze_table_statement::execute");

  if (check_table_access(thd, SELECT_ACL | INSERT_ACL, first_table,
                         FALSE, UINT_MAX, FALSE))
    goto error;
  thd->enable_slow_log= opt_log_slow_admin_statements;
  res= mysql_admin_table(thd, first_table, &m_lex->check_opt,
                         "analyze", lock_type, 1, 0, 0, 0,
                         &handler::ha_analyze, 0);
  /* ! we write after unlocking the table */
  if (!res && !m_lex->no_write_to_binlog)
  {
    /*
      Presumably, ANALYZE and binlog writing doesn't require synchronization
    */
    res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
  }
  m_lex->select_lex.table_list.first= first_table;
  m_lex->query_tables= first_table;

error:
  DBUG_RETURN(res);
}


bool Check_table_statement::execute(THD *thd)
{
  TABLE_LIST *first_table= m_lex->select_lex.table_list.first;
  thr_lock_type lock_type = TL_READ_NO_INSERT;
  bool res= TRUE;
  DBUG_ENTER("Check_table_statement::execute");

  if (check_table_access(thd, SELECT_ACL, first_table,
                         TRUE, UINT_MAX, FALSE))
    goto error; /* purecov: inspected */
  thd->enable_slow_log= opt_log_slow_admin_statements;

  res= mysql_admin_table(thd, first_table, &m_lex->check_opt, "check",
                         lock_type, 0, 0, HA_OPEN_FOR_REPAIR, 0,
                         &handler::ha_check, &view_checksum);

  m_lex->select_lex.table_list.first= first_table;
  m_lex->query_tables= first_table;

error:
  DBUG_RETURN(res);
}


bool Optimize_table_statement::execute(THD *thd)
{
  TABLE_LIST *first_table= m_lex->select_lex.table_list.first;
  bool res= TRUE;
  DBUG_ENTER("Optimize_table_statement::execute");

  if (check_table_access(thd, SELECT_ACL | INSERT_ACL, first_table,
                         FALSE, UINT_MAX, FALSE))
    goto error; /* purecov: inspected */
  thd->enable_slow_log= opt_log_slow_admin_statements;
  res= (specialflag & (SPECIAL_SAFE_MODE | SPECIAL_NO_NEW_FUNC)) ?
    mysql_recreate_table(thd, first_table) :
    mysql_admin_table(thd, first_table, &m_lex->check_opt,
                      "optimize", TL_WRITE, 1, 0, 0, 0,
                      &handler::ha_optimize, 0);
  /* ! we write after unlocking the table */
  if (!res && !m_lex->no_write_to_binlog)
  {
    /*
      Presumably, OPTIMIZE and binlog writing doesn't require synchronization
    */
    res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
  }
  m_lex->select_lex.table_list.first= first_table;
  m_lex->query_tables= first_table;

error:
  DBUG_RETURN(res);
}


bool Repair_table_statement::execute(THD *thd)
{
  TABLE_LIST *first_table= m_lex->select_lex.table_list.first;
  bool res= TRUE;
  DBUG_ENTER("Repair_table_statement::execute");

  if (check_table_access(thd, SELECT_ACL | INSERT_ACL, first_table,
                         FALSE, UINT_MAX, FALSE))
    goto error; /* purecov: inspected */
  thd->enable_slow_log= opt_log_slow_admin_statements;
  res= mysql_admin_table(thd, first_table, &m_lex->check_opt, "repair",
                         TL_WRITE, 1,
                         test(m_lex->check_opt.sql_flags & TT_USEFRM),
                         HA_OPEN_FOR_REPAIR, &prepare_for_repair,
                         &handler::ha_repair, 0);

  /* ! we write after unlocking the table */
  if (!res && !m_lex->no_write_to_binlog)
  {
    /*
      Presumably, REPAIR and binlog writing doesn't require synchronization
    */
    res= write_bin_log(thd, TRUE, thd->query(), thd->query_length());
  }
  m_lex->select_lex.table_list.first= first_table;
  m_lex->query_tables= first_table;

error:
  DBUG_RETURN(res);
}