During upgrade to Paris the following error is seen on the instance
"Unknown column 'sys_cluster_state0.stats' in 'field list'".
Release or Environment
1. The following columns are deleted from the table sys_cluster_state as a part of the fix for the PRB1324899 in Paris.
2. During the upgrade instance may intermittently show the error until the cache flush has occurred on all the nodes of the instance.
The error shown on the instance can be related to a caching issue, However after the upgrade this error is no longer seen on the instance.