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BUG#46961 - archive engine loses rows during self joining select!

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SELECT with join (not only self-join) from archive table may
return incomplete result set, when result set size exceeds
join buffer size.

The problem was that archive row counter was initialzed too
early, when ha_archive::info() method was called. Later,
when optimizer exceeds join buffer, it attempts to reuse
handler without calling ha_archive::info() again (which is
correct).

Fixed by moving row counter initialization from
ha_archive::info() to ha_archive::rnd_init().

mysql-test/r/archive.result:
  A test case for BUG#46961.
mysql-test/t/archive.test:
  A test case for BUG#46961.
storage/archive/ha_archive.cc:
  Since a cursor may get reused without a call to ::info(),
  move assignment of scan_rows to a proper place, that is
  ::rnd_init().
This commit is contained in:
Sergey Vojtovich 2009-09-04 12:29:18 +05:00
commit a7de205747
3 changed files with 25 additions and 1 deletions
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11
mysql-test/r/archive.result
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@ -12695,3 +12695,14 @@ a b
1 NULL
2 NULL
DROP TABLE t1;
SET @save_join_buffer_size= @@join_buffer_size;
SET @@join_buffer_size= 8228;
CREATE TABLE t1(a CHAR(255)) ENGINE=archive;
INSERT INTO t1 VALUES('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'),
('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'),
('aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa');
SELECT COUNT(t1.a) FROM t1, t1 a, t1 b, t1 c, t1 d, t1 e;
COUNT(t1.a)
729
DROP TABLE t1;
SET @@join_buffer_size= @save_join_buffer_size;