name : create_tmp_table.h #ifndef CREATE_TMP_TABLE_INCLUDED #define CREATE_TMP_TABLE_INCLUDED /* Copyright (c) 2021, MariaDB Corporation. 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 */ /* Class for creating internal tempory tables in sql_select.cc */ class Create_tmp_table: public Data_type_statistics { protected: // The following members are initialized only in start() Field **m_from_field, **m_default_field; KEY_PART_INFO *m_key_part_info; uchar *m_group_buff, *m_bitmaps; // The following members are initialized in ctor uint m_alloced_field_count; bool m_using_unique_constraint; uint m_temp_pool_slot; ORDER *m_group; bool m_distinct; bool m_save_sum_fields; bool m_with_cycle; ulonglong m_select_options; ha_rows m_rows_limit; uint m_group_null_items; // counter for distinct/other fields uint m_field_count[2]; // counter for distinct/other fields which can be NULL uint m_null_count[2]; // counter for distinct/other blob fields uint m_blobs_count[2]; // counter for "tails" of bit fields which do not fit in a byte uint m_uneven_bit[2]; public: enum counter {distinct, other}; /* shows which field we are processing: distinct/other (set in processing cycles) */ counter current_counter; Create_tmp_table(ORDER *group, bool distinct, bool save_sum_fields, ulonglong select_options, ha_rows rows_limit); virtual ~Create_tmp_table() {} virtual bool choose_engine(THD *thd, TABLE *table, TMP_TABLE_PARAM *param); void add_field(TABLE *table, Field *field, uint fieldnr, bool force_not_null_cols); TABLE *start(THD *thd, TMP_TABLE_PARAM *param, const LEX_CSTRING *table_alias); bool add_fields(THD *thd, TABLE *table, TMP_TABLE_PARAM *param, List<Item> &fields); bool add_schema_fields(THD *thd, TABLE *table, TMP_TABLE_PARAM *param, const ST_SCHEMA_TABLE &schema_table); bool finalize(THD *thd, TABLE *table, TMP_TABLE_PARAM *param, bool do_not_open, bool keep_row_order); void cleanup_on_failure(THD *thd, TABLE *table); }; #endif /* CREATE_TMP_TABLE_INCLUDED */