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Merge mysql.com:/home/svoj/devel/mysql/BUG30590/mysql-5.0-engines

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into  mysql.com:/home/svoj/devel/mysql/BUG30590/mysql-5.1-engines
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svoj@june.mysql.com
2007-09-13 17:12:46 +05:00
parent fe4f440a2e 6a04238e41
commit ac29e21e0b
5 changed files with 56 additions and 3 deletions
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29
storage/heap/hp_rnext.c
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@@ -33,11 +33,40 @@ int heap_rnext(HP_INFO *info, uchar *record)
heap_rb_param custom_arg;
if (info->last_pos)
{
/*
We enter this branch for non-DELETE queries after heap_rkey()
or heap_rfirst(). As last key position (info->last_pos) is available,
we only need to climb the tree using tree_search_next().
*/
pos = tree_search_next(&keyinfo->rb_tree, &info->last_pos,
offsetof(TREE_ELEMENT, left),
offsetof(TREE_ELEMENT, right));
}
else if (!info->lastkey_len)
{
/*
We enter this branch only for DELETE queries after heap_rfirst(). E.g.
DELETE FROM t1 WHERE a<10. As last key position is not available
(last key is removed by heap_delete()), we must restart search as it
is done in heap_rfirst().
It should be safe to handle this situation without this branch. That is
branch below should find smallest element in a tree as lastkey_len is
zero. tree_search_edge() is a kind of optimisation here as it should be
faster than tree_search_key().
*/
pos= tree_search_edge(&keyinfo->rb_tree, info->parents,
&info->last_pos, offsetof(TREE_ELEMENT, left));
}
else
{
/*
We enter this branch only for DELETE queries after heap_rkey(). E.g.
DELETE FROM t1 WHERE a=10. As last key position is not available
(last key is removed by heap_delete()), we must restart search as it
is done in heap_rkey().
*/
custom_arg.keyseg = keyinfo->seg;
custom_arg.key_length = info->lastkey_len;
custom_arg.search_flag = SEARCH_SAME | SEARCH_FIND;