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BUG#22178: Scan ordered performed also on engines not supporting ordered scans

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Scan of ranges without start key should not use ordered scans unless it
is requested.


sql/ha_partition.cc:
  Scan of ranges without start key should not use ordered scans unless it
  is requested.
sql/ha_partition.h:
  Scan of ranges without start key should not use ordered scans unless it
  is requested.
This commit is contained in:
unknown 2006-09-19 02:56:02 -04:00
parent c690c11feb
commit 392c3122f6
2 changed files with 20 additions and 4 deletions
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17
sql/ha_partition.cc
View file

@ -3655,7 +3655,10 @@ int ha_partition::read_range_first(const key_range *start_key,
if (!start_key) // Read first record
{
m_index_scan_type= partition_index_first;
if (m_ordered)
m_index_scan_type= partition_index_first;
else
m_index_scan_type= partition_index_first_unordered;
error= common_first_last(m_rec0);
}
else
@ -3869,6 +3872,18 @@ int ha_partition::handle_unordered_scan_next_partition(byte * buf)
DBUG_PRINT("info", ("index_first on partition %d", i));
error= file->index_first(buf);
break;
case partition_index_first_unordered:
/*
We perform a scan without sorting and this means that we
should not use the index_first since not all handlers
support it and it is also unnecessary to restrict sort
order.
*/
DBUG_PRINT("info", ("read_range_first on partition %d", i));
table->record[0]= buf;
error= file->read_range_first(0, end_range, eq_range, 0);
table->record[0]= m_rec0;
break;
default:
DBUG_ASSERT(FALSE);
DBUG_RETURN(1);

7
sql/ha_partition.h
View file

@ -45,9 +45,10 @@ private:
{
partition_index_read= 0,
partition_index_first= 1,
partition_index_last= 2,
partition_index_read_last= 3,
partition_no_index_scan= 4
partition_index_first_unordered= 2,
partition_index_last= 3,
partition_index_read_last= 4,
partition_no_index_scan= 5
};
/* Data for the partition handler */
int m_mode; // Open mode