Description:
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Malformed SQL passed into executeQuery does not cause an exception to be thrown. The package here is marked as SDO. It may be that the actual issue lies in PDO so we need to do some investigation here and possibly address is to PDO if we can't resolve. 

Reproduce code:
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For example, 

$stmt = "fsdfsf";
$root = $das->executeQuery($dbh, $stmt);

Does not apparently throw an exception

Expected result:
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Would expect this to raise an exception. Probably and exception containing SQLSTATE 42703 in this case

Actual result:
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Execution follows to the next line.