Helper method for checking against required and optional query attrs

[dstansby]

The logic for checking a query in jsoc seems quite common, and I need to use similar logic in the SPDF client I am writing. It seems sensible to put it in a helper method. Questions

I'm not sure what it should be called? (simple_can_handle_query is a bit of a rubbish name...)

[nabobalis]

What about query_handler?

[Cadair]

I think this would be useful as a helper as a part of a more complex _can_handle_query, i.e. you could call this first and then check specific values of attrs later having verified the types are there with this, so I think the name should reflect that as well. (Also I think this pattern might be useable in some of the dataretriever clients as well, maybe you could check?)

So maybe something like check_attr_types_in_query?