Diverged view prevents schema propagation to the entire view hierarchy

if (view.getBaseColumnCount() == QueryConstants.DIVERGED_VIEW_BASE_COLUMN_COUNT) {
                // if a view has divorced itself from the base table, we don't allow schema changes
                // to be propagated to it.
            	return new MetaDataMutationResult(MutationCode.UNALLOWED_TABLE_MUTATION, EnvironmentEdgeManager.currentTimeMillis(), null);
            }