In MODE-934 we added support for the "jcr:path" pseudo-column, and in MODE-933 this pseudo-column (and other pseudo-columns) were exposed as additional columns on every table. This "jcr:path" column in JDBC is effectively a primary key, and should be exposed as such in JDBC's Database MetaData.

Additionally, any table corresponding to a node that that is or (directly or indirectly) extends the "mix:referenceable" mixin node type will have a "jcr:uuid" column, and this column can be exposed as a unique key in JDBC's Database MetaData.