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/* - mode: c; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2010 Brian Aker
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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 02110-1301 USA
*/
#include <config.h>
#include <plugin/utility_dictionary/dictionary.h>
#include <drizzled/atomics.h>
#include <drizzled/session.h>
#include <drizzled/sql_lex.h>
using namespace drizzled;
using namespace std;
drizzled::atomic<uint64_t> counter;
utility_dictionary::Counter::Counter() :
plugin::TableFunction("DATA_DICTIONARY", "COUNTER")
{
add_field("VALUE", plugin::TableFunction::NUMBER, 0, false);
}
bool utility_dictionary::Counter::Generator::populate()
{
if (lex().isSumExprUsed() && count > 0)
return false;
if (lex().current_select->group_list.elements && count > 0)
return false;
if (lex().current_select->explicit_limit or count == 0)
{
push(counter.increment());
}
else
{
return false;
}
count++;
return true;
}
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