No error when a field-access element shares the same name as a parameter

[xterao]

Description:

During the DAO method argument usage validation, if a SQL field-access element calls a property with the same name as a method parameter, that parameter is considered “used” and does not get error-highlighted.

Cause:

The check for a preceding DOT returns null, causing the code to skip generating an error.

Expected Behavior:

Ignore property names that are part of a field-access chain and ensure the corresponding method parameter is correctly error-highlighted when it is never actually used.