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Bug#13025132 - PARTITIONS USE TOO MUCH MEMORY

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Additional patch to remove the part_id -> ref_buffer offset.

The partitioning id and the associate record buffer can
be found without having to calculate it.

By initializing it for each used partition, and then reuse
the key-buffer from the queue, it is not needed to have
such map.
This commit is contained in:
Mattias Jonsson
2012-08-17 14:25:32 +02:00
parent bcee9f1896
commit 1ffecedfc3
2 changed files with 13 additions and 35 deletions
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17
sql/ha_partition.h
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@@ -524,23 +524,6 @@ private:
int partition_scan_set_up(uchar * buf, bool idx_read_flag);
int handle_unordered_next(uchar * buf, bool next_same);
int handle_unordered_scan_next_partition(uchar * buf);
uchar *queue_buf(uint part_id)
{
uint16 *part_id_map= (uint16*) m_ordered_rec_buffer;
/* Offset to the partition's record buffer in number of partitions. */
uint offset= part_id_map[part_id];
/*
Return the pointer to the partition's record buffer.
First skip the partition id map, and then add the offset.
*/
return (m_ordered_rec_buffer + m_tot_parts * PARTITION_BYTES_IN_POS +
(offset * (m_rec_length + PARTITION_BYTES_IN_POS)));
}
uchar *rec_buf(uint part_id)
{
return (queue_buf(part_id) +
PARTITION_BYTES_IN_POS);
}
int handle_ordered_index_scan(uchar * buf, bool reverse_order);
int handle_ordered_next(uchar * buf, bool next_same);
int handle_ordered_prev(uchar * buf);