rdblue opened a new pull request #654: Move identifier validation into 
BaseMetastoreCatalog
URL: https://github.com/apache/incubator-iceberg/pull/654
 
 
   For catalogs that extend `BaseMetastoreCatalog`, identifier validation is 
difficult to implement. Identifiers should be validated before they are passed 
to `newTableOps` because validation in `newTableOps` doesn't have enough 
information to throw the correct exception: from `createTable` it should throw 
a `ValidationException` but from `loadTable` it should throw 
`NoSuchTableException`.
   
   It is also difficult to ensure that metadata tables work with identifier 
validation because metadata tables rely on a valid identifier but may not be a 
valid identifier themselves. For example, Hive tables require 1 level of 
namespacing, but metadata tables use the full valid table identifier as a 
namespace.
   
   This moves validation to a method that can be overridden and fixes some of 
these difficult cases.

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