Adds new field expression to the dataset.
function AddFieldExpression(const FieldName: string; const Expression: TExpression; StrictReferences: boolean = False): TFieldExpression; overload;
The method adds new field expression to the dataset.
To delete the field expression, TCustomEntityDataSet.DeleteFieldExpression method is used. To clear all dataset field expressions, the TCustomEntityDataSet.ClearFieldExpressions method is used.