Description:
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Using php 5.1CVS checked out around 19th 2005 and pdo + pdo_mysql packaged in that cvs checkout.

Reproduce code:
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use mysql_pdo:

$st = $db->prepare("select * from test where c = 2 AND (a = :a OR b = :a)");

$st->execute(array(":a" => 2));



Expected result:
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Rows matching where a == 2 or b == 2. 

Actual result:
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0 row result regardless of what's in the database. No error or exceptions from pdo.