Description:
------------
When the select statement includes only one column, the script crashes with "zend_mm_heap corrupted" or segmentation fault errors. When we add a dummy column to the select statement, the script runs successfully. Looks like some data structure initialization bug.

For example, 

select name0 from COMPANY where name0 like 'A%'; -- errors out

select name0,1 from COMPANY where name0 like 'A%'; -- runs successfully

Test script:
---------------
<?php
$db_conn = odbc_connect('NZSQL','<username>','<password>') or alert("Could not connect: " . odbc_error());
echo "Connected successfully!\n";
$query="select name0 from COMPANY where name0 like 'A%' ";
echo "executing ...\n";
$result = odbc_exec($db_conn,$query);
echo "executed query ...\n";
if (!$result)   alert("Could not run query: " . odbc_error());
echo "fetching resultset ...\n";

while(odbc_fetch_array($result)) {
  $row0 = odbc_result($result, 1);
  echo "field1:$row0\n";
}
odbc_close($db_conn);
echo "Completed successfully\n";
function alert($errMsg) {
        fwrite(STDERR, "$errMsg\n"); exit(2);
}
?>

Expected result:
----------------
Connected successfully!
executing ...
executed query ...
fetching resultset ...
field1:<company names>
....
Completed successfully


Actual result:
--------------
Connected successfully!
executing ...
zend_mm_heap corrupted