1 files changed, 80 insertions, 0 deletions
diff --git a/sql/create_tmp_table.h b/sql/create_tmp_table.h
new file mode 100644
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+++ b/sql/create_tmp_table.h
@@ -0,0 +1,80 @@
+#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 */