mariadb/storage/spider/spd_group_by_handler.h

/* Copyright (C) 2016 Kentoku Shiba

  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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

class spider_group_by_handler: public group_by_handler
{
  Query query;
  spider_fields *fields;
  ha_spider *spider;
  SPIDER_TRX *trx;
  spider_db_result *result;
  bool first;
  longlong offset_limit;
  int store_error;
  /*
    Bitmap marking constant items among the select items. They are
    SELECTed in the query executed at the data node, but not stored in
    SPIDER_DB_ROW, because the temp table do not contain the
    corresponding fields.
  */
  MY_BITMAP skips;

public:
  spider_group_by_handler(
    THD *thd_arg,
    Query *query_arg,
    spider_fields *fields_arg,
    const MY_BITMAP &skips1
  );
  ~spider_group_by_handler();
  int init_scan() override;
  int next_row() override;
  int end_scan() override;
};

group_by_handler *spider_create_group_by_handler(
  THD *thd,
  Query *query
);