Currently metadata validation messages don't contain schema name, so when working with lot of schemas it may be difficult to find out problematic element. For example, if table SOME_TABLE has no columns then
org.teiid.query.metadata.MetadataValidator.MinimalMetadata.execute() will log following error message:
TEIID31071 Invalid table; Table SOME_TABLE has no columns defined
And there's no ability to detect later to which schema problematic table belongs.

I suggest to append schema name - either by simple concatenation in MetadataValidator.java:

metadataValidator.log(report, model, QueryPlugin.Util.gs(QueryPlugin.Event.TEIID31071, scmena.getName()+"."+t.getName()));

or by changing message bundle i18n.properties:

TEIID31071=Invalid table; Table

.

has no columns defined

and providing message parameters in MetadataValidator.java:

metadataValidator.log(report, model, QueryPlugin.Util.gs(QueryPlugin.Event.TEIID31071, scmena.getName(), t.getName()));

There are also another validation messages in MetadataValidator.java which could be improved in similar way.