Function create_tmp_field

sql/sql_select.cc:21903–21923

Create field for temporary table. @param table Temporary table @param item Item to create a field for @param type Type of item (normally item->type) @param copy_func If set and item is a function, store copy of item in this array @param from_field if field will be created using other field as example, pointer

  either direct or referenced by an Item_ref.
*/
Field *create_tmp_field(TABLE *table, Item *item,
                        Item ***copy_func, Field **from_field,
                        Field **default_field,
                        bool group, bool modify_item,
                        bool table_cant_handle_bit_fields,
                        bool make_copy_field)
{
  Tmp_field_src src;
  Tmp_field_param prm(group, modify_item, table_cant_handle_bit_fields,
                      make_copy_field);
  Field *result= item->create_tmp_field_ex(table->in_use->mem_root,
                                           table, &src, &prm);
  if (is_json_type(item) && make_json_valid_expr(table, result))
    result= NULL;

  *from_field= src.field();
  *default_field= src.default_field();
  if (src.item_result_field())
    *((*copy_func)++)= src.item_result_field();
  return result;
}

/*
  Set up column usage bitmaps for a temporary table