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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2008 Sun Microsystems, Inc.
*
* 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 02110-1301 USA
*/
#include "config.h"
#include <drizzled/function/str/make_set.h>
#include <drizzled/session.h>
namespace drizzled
{
void Item_func_make_set::update_used_tables()
{
Item_func::update_used_tables();
item->update_used_tables();
used_tables_cache|=item->used_tables();
const_item_cache&=item->const_item();
}
void Item_func_make_set::split_sum_func(Session *session_arg, Item **ref_pointer_array,
List<Item> &fields)
{
item->split_sum_func(session_arg, ref_pointer_array, fields, &item, true);
Item_str_func::split_sum_func(session_arg, ref_pointer_array, fields);
}
void Item_func_make_set::fix_length_and_dec()
{
max_length=arg_count-1;
if (agg_arg_charsets(collation, args, arg_count, MY_COLL_ALLOW_CONV, 1))
return;
for (uint32_t i=0 ; i < arg_count ; i++)
max_length+=args[i]->max_length;
used_tables_cache|= item->used_tables();
not_null_tables_cache&= item->not_null_tables();
const_item_cache&= item->const_item();
with_sum_func= with_sum_func || item->with_sum_func;
}
String *Item_func_make_set::val_str(String *str)
{
assert(fixed == 1);
uint64_t bits;
bool first_found=0;
Item **ptr=args;
String *result=&my_empty_string;
bits=item->val_int();
if ((null_value=item->null_value))
return NULL;
if (arg_count < 64)
bits &= ((uint64_t) 1 << arg_count)-1;
for (; bits; bits >>= 1, ptr++)
{
if (bits & 1)
{
String *res= (*ptr)->val_str(str);
if (res) // Skip nulls
{
if (!first_found)
{ // First argument
first_found=1;
if (res != str)
result=res; // Use original string
else
{
if (tmp_str.copy(*res)) // Don't use 'str'
return &my_empty_string;
result= &tmp_str;
}
}
else
{
if (result != &tmp_str)
{ // Copy data to tmp_str
if (tmp_str.alloc(result->length()+res->length()+1) ||
tmp_str.copy(*result))
return &my_empty_string;
result= &tmp_str;
}
if (tmp_str.append(STRING_WITH_LEN(","), &my_charset_bin) || tmp_str.append(*res))
return &my_empty_string;
}
}
}
}
return result;
}
Item *Item_func_make_set::transform(Item_transformer transformer, unsigned char *arg)
{
Item *new_item= item->transform(transformer, arg);
if (!new_item)
return 0;
/*
Session::change_item_tree() should be called only if the tree was
really transformed, i.e. when a new item has been created.
Otherwise we'll be allocating a lot of unnecessary memory for
change records at each execution.
*/
if (item != new_item)
session.change_item_tree(&item, new_item);
return Item_str_func::transform(transformer, arg);
}
void Item_func_make_set::print(String *str, enum_query_type query_type)
{
str->append(STRING_WITH_LEN("make_set("));
item->print(str, query_type);
if (arg_count)
{
str->append(',');
print_args(str, 0, query_type);
}
str->append(')');
}
} /* namespace drizzled */
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