Schema mismatch mistakes will not get proper detail level, yielding the following:
Caused by: org.apache.flink.table.api.ValidationException: Field types of query result and registered TableSink [baz_sink] do not match.
Query result schema: [a: Integer, EXPR$2: Row]
TableSink schema: [a: Integer, payload: Row]
Leaving the user with an opaque 'Row' type to debug.