Hi all, I've just started having a look at how to add scalar functions like SUBSTRING, CONCAT, UPPER... to MetaModel.
I started by adding these functions to the MetaModel parser. There is already a FunctionType enum that takes care of all the aggregate functions (SUM, COUNT, AVG...) This FunctionType is used in the SelectItemParser to find out the function type and parse it accordingly. Not sure if I should add a new "ScalarFunctionType" enum or modify somehow the existing one to take into account the new scalar functions. I do not like the idea of having quite different "semantic" elements within the same enum type but neither like the idea of having to ask everywhere whether the function is scalar or not. I'm thinking of creating kinda enum hierarchical data structure, but still not sure how to do it because the FunctionType has several methods that are very coupled to the aggregate functions (abstract AggregateBuilder, evaluate...) Any ideas? Kind regards, Alberto
