What is the use of Expression field in ViewObject  attribute?

I have the following expression in a view object attribute lower(some_column_name) of a view which is read-only. But it does not seem to do anything? Am I doing anythingh wrong?
Secondly if the expression, as I think is for doing things like using db functions, can they be parameterized like decode(:1, 'foobar', foo, bar)

The expression for a view object is used in two places:
1. In the automatically-generated SELECT statement if your view object is not in expert mode.
2. In the ViewCriteria-related query by example clause if the attribute is queriable and the user specifies some query criteria against it.
If your VO is an expert-mode view object, then the entire SQL statement is in the SQL panel and is fully-under developer control.
Any read-only VO with no entity objects will be automatically an expert mode VO.

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