Method save_explain_data_intern

sql/sql_delete.cc:105–220

bool Update_plan::save_explain_data_intern(THD *thd,
                                           MEM_ROOT *mem_root,
                                           Explain_update *explain,
                                           bool is_analyze)
{
  explain->select_type= "SIMPLE";
  explain->table_name.append(table->alias);
  
  explain->impossible_where= false;
  explain->no_partitions= false;

  if (impossible_where)
  {
    explain->impossible_where= true;
    return 0;
  }

  if (no_partitions)
  {
    explain->no_partitions= true;
    return 0;
  }
  
  if (is_analyze ||
      (thd->variables.log_slow_verbosity &
       LOG_SLOW_VERBOSITY_ENGINE))
  {
    explain->table_tracker.set_gap_tracker(&explain->extra_time_tracker);
    table->file->set_time_tracker(&explain->table_tracker);

    if (table->file->handler_stats && table->s->tmp_table != INTERNAL_TMP_TABLE)
      explain->handler_for_stats= table->file;
  }

  select_lex->set_explain_type(TRUE);
  explain->select_type= select_lex->type;
  /* Partitions */
  {
#ifdef WITH_PARTITION_STORAGE_ENGINE
    partition_info *part_info;
    if ((part_info= table->part_info))
    {          
      make_used_partitions_str(mem_root, part_info, &explain->used_partitions,
                               explain->used_partitions_list);
      explain->used_partitions_set= true;
    }
    else
      explain->used_partitions_set= false;
#else
    /* just produce empty column if partitioning is not compiled in */
    explain->used_partitions_set= false;
#endif
  }


  /* Set jtype */
  if (select && select->quick)
  {