Answer / guest

Cause: You have specified a materialized view using the
UNION operator and the respective queries on each side of
the UNION operator do not have the same select list. The
RELATED_NAME column shows the alias of the first different
select list item. The RELATED_NUM column shows the offset
from the SELECT keyword to the start of this select list item.

Action: Restructure the materialized view query such that
the respective sides of the UNION operator have identical
select lists.

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