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/* Copyright (c) 2017, MariaDB Corporation.
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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
/**
@brief
System Versioning items
*/
#include "mariadb.h"
#include "sql_priv.h"
#include "sql_class.h"
#include "tztime.h"
#include "item.h"
Item_func_trt_ts::Item_func_trt_ts(THD *thd, Item* a, TR_table::field_id_t _trt_field) :
Item_datetimefunc(thd, a),
trt_field(_trt_field)
{
decimals= 6;
null_value= true;
DBUG_ASSERT(arg_count == 1 && args[0]);
}
bool
Item_func_trt_ts::get_date(MYSQL_TIME *res, ulonglong fuzzy_date)
{
THD *thd= current_thd; // can it differ from constructor's?
DBUG_ASSERT(thd);
DBUG_ASSERT(args[0]);
if (args[0]->result_type() != INT_RESULT)
{
my_error(ER_ILLEGAL_PARAMETER_DATA_TYPE_FOR_OPERATION, MYF(0),
args[0]->type_handler()->name().ptr(),
func_name());
return true;
}
ulonglong trx_id= args[0]->val_uint();
if (trx_id == ULONGLONG_MAX)
{
null_value= false;
thd->variables.time_zone->gmt_sec_to_TIME(res, TIMESTAMP_MAX_VALUE);
res->second_part= TIME_MAX_SECOND_PART;
return false;
}
TR_table trt(thd);
null_value= !trt.query(trx_id);
if (null_value)
return true;
return trt[trt_field]->get_date(res, fuzzy_date);
}
Item_func_trt_id::Item_func_trt_id(THD *thd, Item* a, TR_table::field_id_t _trt_field,
bool _backwards) :
Item_longlong_func(thd, a),
trt_field(_trt_field),
backwards(_backwards)
{
decimals= 0;
unsigned_flag= 1;
null_value= true;
DBUG_ASSERT(arg_count == 1 && args[0]);
}
Item_func_trt_id::Item_func_trt_id(THD *thd, Item* a, Item* b, TR_table::field_id_t _trt_field) :
Item_longlong_func(thd, a, b),
trt_field(_trt_field),
backwards(false)
{
decimals= 0;
unsigned_flag= 1;
null_value= true;
DBUG_ASSERT(arg_count == 2 && args[0] && args[1]);
}
longlong
Item_func_trt_id::get_by_trx_id(ulonglong trx_id)
{
THD *thd= current_thd;
DBUG_ASSERT(thd);
if (trx_id == ULONGLONG_MAX)
{
null_value= true;
return 0;
}
TR_table trt(thd);
null_value= !trt.query(trx_id);
if (null_value)
return 0;
return trt[trt_field]->val_int();
}
longlong
Item_func_trt_id::get_by_commit_ts(MYSQL_TIME &commit_ts, bool backwards)
{
THD *thd= current_thd;
DBUG_ASSERT(thd);
TR_table trt(thd);
null_value= !trt.query(commit_ts, backwards);
if (null_value)
return backwards ? ULONGLONG_MAX : 0;
return trt[trt_field]->val_int();
}
longlong
Item_func_trt_id::val_int()
{
if (args[0]->is_null())
{
if (arg_count < 2 || trt_field == TR_table::FLD_TRX_ID)
{
null_value= true;
return 0;
}
return get_by_trx_id(args[1]->val_uint());
}
else
{
MYSQL_TIME commit_ts;
if (args[0]->get_date(&commit_ts, 0))
{
null_value= true;
return 0;
}
if (arg_count > 1)
{
backwards= args[1]->val_bool();
DBUG_ASSERT(arg_count == 2);
}
return get_by_commit_ts(commit_ts, backwards);
}
}
Item_func_trt_trx_sees::Item_func_trt_trx_sees(THD *thd, Item* a, Item* b) :
Item_bool_func(thd, a, b),
accept_eq(false)
{
null_value= true;
DBUG_ASSERT(arg_count == 2 && args[0] && args[1]);
}
longlong
Item_func_trt_trx_sees::val_int()
{
THD *thd= current_thd;
DBUG_ASSERT(thd);
DBUG_ASSERT(arg_count > 1);
ulonglong trx_id1= args[0]->val_uint();
ulonglong trx_id0= args[1]->val_uint();
bool result= accept_eq;
TR_table trt(thd);
null_value= trt.query_sees(result, trx_id1, trx_id0);
return result;
}
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