It seems to me we have a bug in nested joins:
Consider the statement below. It's supposed to show foreign key fields
which it does nicely with FB2.5. With 3.0 you'll get the error "Column
unknown. RF.RDB$FIELD_NAME. At line 11, column 32." - this is the
postponed on clause (i.RDB$RELATION_NAME = rf.RDB$RELATION_NAME):
select
rf.RDB$RELATION_NAME,
rf.RDB$FIELD_NAME,
s.RDB$INDEX_NAME
from RDB$RELATION_FIELDS rf
left join (RDB$INDICES i
join RDB$INDEX_SEGMENTS s
on i.RDB$INDEX_NAME = s.RDB$INDEX_NAME and s.RDB$FIELD_NAME =
rf.RDB$FIELD_NAME
join RDB$RELATION_CONSTRAINTS rc
on rc.RDB$INDEX_NAME = s.RDB$INDEX_NAME and rc.RDB$CONSTRAINT_TYPE =
'FOREIGN KEY')
on i.RDB$RELATION_NAME = rf.RDB$RELATION_NAME
where
rf.RDB$FIELD_SOURCE starting with 'D_FK_'
Did I miss something or does this turn out to be a bug?
Greetings, Thomas
--
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