Add Preview Data feature

[blafond]

Add the ability to select a table/view/procedure and execute either a canned query (SELECT * xxx) or a customer query.

Rather than deploying entire VDBs (dependant as well), it might make more sense to construct a temporary dynamic VDB containing a simple entry for each dependent model + the selected model.
These models would contain DDL representing only the tables necessary to execute the query on the source(s).

Benefits : would include removing (or drastically reducing the complexity) the whole framework around maintaining a project VDB as well a preview VDB for each model
Drawbacks

• there may be a performance hit to always deploy a VDB (and undeploy) for Preview Data
• Views using UDF methods would need to include the function in the DDL. UDF jar would have to be deployed separately prior to deploying the dyn. vdb.