Method add_node

sql/sql_explain.cc:106–144

void Explain_query::add_node(Explain_node *node)
{
  uint select_id;
  operations++;
  if (node->get_type() == Explain_node::EXPLAIN_UNION)
  {
    Explain_union *u= (Explain_union*)node;
    select_id= u->get_select_id();
    if (unions.elements() <= select_id)
      unions.resize(MY_MAX(select_id+1, unions.elements()*2), NULL);

    Explain_union *old_node;
    if ((old_node= get_union(select_id)))
      delete old_node;

    unions.at(select_id)= u;
  }
  else
  {
    Explain_select *sel= (Explain_select*)node;
    if (sel->select_id == FAKE_SELECT_LEX_ID)
    {
      DBUG_ASSERT(0); // this is a "fake select" from a UNION.
    }
    else
    {
      select_id= sel->select_id;
      Explain_select *old_node;

      if (selects.elements() <= select_id)
        selects.resize(MY_MAX(select_id+1, selects.elements()*2), NULL);

      if ((old_node= get_select(select_id)))
        delete old_node;

      selects.at(select_id)= sel;
    }
  }
}


void Explain_query::add_insert_plan(Explain_insert *insert_plan_arg)