| ERROR | the materialized view has a join operation in the outer UNION block |
| CAUSE | Fast refresh is not supported if a materialized view having the UNION operator contains a join operation. |
| ACTION | Rewrite the materialized view query without the join. |
| ERROR | the materialized view has a join operation in the outer UNION block |
| CAUSE | Fast refresh is not supported if a materialized view having the UNION operator contains a join operation. |
| ACTION | Rewrite the materialized view query without the join. |