Hello,
We have two virtual tables that are ordered, and we do a "union all" of
them asking from SQLite to keep the result ordered.
So the query looks like this:
select * from (select x from ordered_VT1 UNION ALL select x from
ordered_VT2) order by x;
Both of ordered_VT1, ordered_VT2 report back (via BestIndex) that their
results are ordered on x. Note that when SQLite negotiates with the
ordered_VT1,2 (via BestIndex), it doesn't even ask them if an ordering
on x already exists.
Right now SQLite does a full scan of ordered_VT1, and then ordered_VT2
before starting to produce results.
Shouldn't it do a merge union all of the two? Is there some way to help
SQLite's planner to "see" that such a possibility exists?
Kind regards,
l.
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