Cause
An attempt was made to call either the CURRENT_SHARD_KEY or CURRENT_PSET_KEY function to filter results of a sharded query with full outer joins.
Action
Disable filtering shard query results for queries with full outer joins.
Oracle 26ai
ORA-03811
Error Message
Filtering shard query results based on the CURRENT_SHARD_KEY or CURRENT_PSET_KEY function is not supported with full outer joins.