Question: Recently I have migrated my test site from `windows classic` to `claim based authentication`. Before doing the same in production, how to check if my site collection is working fine? What are the potential issues that we may face after changed authentication modelto `claims` from `classic`? The Site contains a number of groups, workflows etc.. Any suggestion will be highly appreciated.

Answer: 
Unfortunately my reputation is not enough for commenting...

If you want only filter your table, then use the different Filter Webparts in Sharepoint. 
There are different Filters for input fields, GET-Parameters, etc.

But, you can't use any filter for any lists. You have to try it. 

I hope, that helps you...
I don't really understand the question, but if you want to query a list for items in specific columns depending on different circumstances, you should use CAMLQuery

[U2U CAMLQuery helper](http://www.u2u.be/Software) is a nice tool to get started.