Constructor. Perform a positive truth test("this = 1").
Parameters: qs - the QueryExpression Parameters: mapping - the mapping associated to this expression Parameters: te - the TableExpression where this expression refers to
Constructor. Perform a truth test
Parameters: qs - the QueryExpression Parameters: mapping - the mapping associated to this expression Parameters: te - the TableExpression where this expression refers to Parameters: truthTest - true for positive ("this = 1"), 0 for negative ("this = 0")