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Simpler arena swapping code

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Now thd->mem_root is a pointer to thd->main_mem_root and THR_MALLOC is a pointer to thd->mem_root.
This gives us the following benefits:
- Allow us to easily detect if arena has already been swapped before (this fixes a bug in setup_conds() where arena was swaped twice in some cases)
- Faster swaps of arenas (as we don't have to copy the whole MEM_ROOT)
- We don't anymore have to call my_pthread_setspecific_ptr(THR_MALLOC,...) to change where memory is alloced. Now it's enough to set thd->mem_root
This commit is contained in:
monty@mysql.com
2004-11-08 01:13:54 +02:00
parent e93450d442
commit b903a129e2
32 changed files with 243 additions and 216 deletions
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2
sql/sql_select.h
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@ -354,7 +354,7 @@ class store_key :public Sql_alloc
field_arg->table, field_arg->charset());
else
{
to_field=field_arg->new_field(&thd->mem_root,field_arg->table);
to_field=field_arg->new_field(thd->mem_root,field_arg->table);
if (to_field)
to_field->move_field(ptr, (uchar*) null, 1);
}