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80 lines
2.7 KiB
C++
80 lines
2.7 KiB
C++
#ifndef CREATE_TMP_TABLE_INCLUDED
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#define CREATE_TMP_TABLE_INCLUDED
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/* Copyright (c) 2021, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
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/*
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Class for creating internal tempory tables in sql_select.cc
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*/
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class Create_tmp_table: public Data_type_statistics
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{
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protected:
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// The following members are initialized only in start()
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Field **m_from_field, **m_default_field;
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KEY_PART_INFO *m_key_part_info;
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uchar *m_group_buff, *m_bitmaps;
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// The following members are initialized in ctor
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uint m_alloced_field_count;
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bool m_using_unique_constraint;
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uint m_temp_pool_slot;
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ORDER *m_group;
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bool m_distinct;
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bool m_save_sum_fields;
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bool m_with_cycle;
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ulonglong m_select_options;
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ha_rows m_rows_limit;
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uint m_group_null_items;
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// counter for distinct/other fields
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uint m_field_count[2];
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// counter for distinct/other fields which can be NULL
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uint m_null_count[2];
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// counter for distinct/other blob fields
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uint m_blobs_count[2];
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// counter for "tails" of bit fields which do not fit in a byte
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uint m_uneven_bit[2];
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public:
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enum counter {distinct, other};
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/*
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shows which field we are processing: distinct/other (set in processing
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cycles)
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*/
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counter current_counter;
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Create_tmp_table(ORDER *group, bool distinct, bool save_sum_fields,
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ulonglong select_options, ha_rows rows_limit);
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virtual ~Create_tmp_table() {}
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virtual bool choose_engine(THD *thd, TABLE *table, TMP_TABLE_PARAM *param);
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void add_field(TABLE *table, Field *field, uint fieldnr,
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bool force_not_null_cols);
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TABLE *start(THD *thd,
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TMP_TABLE_PARAM *param,
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const LEX_CSTRING *table_alias);
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bool add_fields(THD *thd, TABLE *table,
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TMP_TABLE_PARAM *param, List<Item> &fields);
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bool add_schema_fields(THD *thd, TABLE *table,
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TMP_TABLE_PARAM *param,
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const ST_SCHEMA_TABLE &schema_table);
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bool finalize(THD *thd, TABLE *table, TMP_TABLE_PARAM *param,
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bool do_not_open, bool keep_row_order);
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void cleanup_on_failure(THD *thd, TABLE *table);
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};
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#endif /* CREATE_TMP_TABLE_INCLUDED */
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