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merge

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This commit is contained in:
Mattias Jonsson
2010-07-09 15:02:27 +02:00
parent 07e1cdc179 6433a55356
commit a0752a9eaf
4 changed files with 75 additions and 12 deletions
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52
sql/ha_partition.cc
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@ -4370,6 +4370,58 @@ int ha_partition::index_read_last_map(uchar *buf, const uchar *key,
}
/*
Optimization of the default implementation to take advantage of dynamic
partition pruning.
*/
int ha_partition::index_read_idx_map(uchar *buf, uint index,
const uchar *key,
key_part_map keypart_map,
enum ha_rkey_function find_flag)
{
int error= HA_ERR_KEY_NOT_FOUND;
DBUG_ENTER("ha_partition::index_read_idx_map");
if (find_flag == HA_READ_KEY_EXACT)
{
uint part;
m_start_key.key= key;
m_start_key.keypart_map= keypart_map;
m_start_key.flag= find_flag;
m_start_key.length= calculate_key_len(table, index, m_start_key.key,
m_start_key.keypart_map);
get_partition_set(table, buf, index, &m_start_key, &m_part_spec);
/* How can it be more than one partition with the current use? */
DBUG_ASSERT(m_part_spec.start_part == m_part_spec.end_part);
for (part= m_part_spec.start_part; part <= m_part_spec.end_part; part++)
{
if (bitmap_is_set(&(m_part_info->used_partitions), part))
{
error= m_file[part]->index_read_idx_map(buf, index, key,
keypart_map, find_flag);
if (error != HA_ERR_KEY_NOT_FOUND &&
error != HA_ERR_END_OF_FILE)
break;
}
}
}
else
{
/*
If not only used with READ_EXACT, we should investigate if possible
to optimize for other find_flag's as well.
*/
DBUG_ASSERT(0);
/* fall back on the default implementation */
error= handler::index_read_idx_map(buf, index, key, keypart_map, find_flag);
}
DBUG_RETURN(error);
}
/*
Read next record in a forward index scan