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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 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
*/
#pragma once
namespace drizzled
{
namespace optimizer
{
class KeyUse
{
public:
KeyUse()
:
table(NULL),
val(NULL),
used_tables(0),
key(0),
keypart(0),
optimize(0),
keypart_map(0),
ref_table_rows(0),
null_rejecting(false),
cond_guard(NULL)
{}
KeyUse(Table *in_table,
Item *in_val,
table_map in_used_tables,
uint32_t in_key,
uint32_t in_keypart,
uint32_t in_optimize,
key_part_map in_keypart_map,
ha_rows in_ref_table_rows,
bool in_null_rejecting,
bool *in_cond_guard)
:
table(in_table),
val(in_val),
used_tables(in_used_tables),
key(in_key),
keypart(in_keypart),
optimize(in_optimize),
keypart_map(in_keypart_map),
ref_table_rows(in_ref_table_rows),
null_rejecting(in_null_rejecting),
cond_guard(in_cond_guard)
{}
Table *getTable()
{
return table;
}
Item *getVal()
{
return val;
}
table_map getUsedTables() const
{
return used_tables;
}
uint32_t getKey() const
{
return key;
}
uint32_t getKeypart() const
{
return keypart;
}
uint32_t getOptimizeFlags() const
{
return optimize;
}
key_part_map getKeypartMap() const
{
return keypart_map;
}
ha_rows getTableRows() const
{
return ref_table_rows;
}
void setTableRows(ha_rows input)
{
ref_table_rows= input;
}
bool isNullRejected() const
{
return null_rejecting;
}
bool *getConditionalGuard()
{
return cond_guard;
}
private:
Table *table; /**< Pointer to the table this key belongs to */
Item *val; /**< or value if no field */
table_map used_tables;
uint32_t key;
uint32_t keypart;
uint32_t optimize; /**< 0, or KEY_OPTIMIZE_* */
key_part_map keypart_map;
ha_rows ref_table_rows;
/**
* If true, the comparison this value was created from will not be
* satisfied if val has NULL 'value'.
*/
bool null_rejecting;
/**
* !NULL - This KeyUse was created from an equality that was wrapped into
* an Item_func_trig_cond. This means the equality (and validity of
* this KeyUse element) can be turned on and off. The on/off state
* is indicted by the pointed value:
* *cond_guard == true <=> equality condition is on
* *cond_guard == false <=> equality condition is off
*
* NULL - Otherwise (the source equality can't be turned off)
*/
bool *cond_guard;
};
} /* end namespace optimizer */
} /* end namespace drizzled */
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