Description:
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I was trying to use PDO_ODBC with HP Vertica but it returns the "Invalid buffer position" error.

I don't have this problem using ODBC Functions and I am using it now instead of PDO_ODBC but decided to report the issue anyways...

By looking at the ODBC trace files, I see that when pdo_odbc binds parameter, it always sets the BufferLength argument of the SQLBindParameter() function to 0. I believe this is wrong, since the input is a character type, and as a result there is a buffer overrun.

Test script:
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$query = "select * from category where name = :nome";        
$sth = $this->_lnk->prepare($query);        
$category = 'Hardcore';        
$sth->bindParam(':nome', $category);        
$sth->execute();

Expected result:
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The query result

Actual result:
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Fails with error:

Fatal error: Uncaught exception 'PDOException' with message 'SQLSTATE[HY000]: General error: 50240 [Vertica][Support] (50240) Invalid buffer position. (SQLExecute[50240] at /builddir/build/BUILD/php-5.4.21/ext/pdo_odbc/odbc_stmt.c:254)' in /admin_vertica_report.class.php on line 39