Re: UNION in a VIEW?

Tom, Gordon,

> You're correct, an outer WHERE clause will not be pushed down into
> the member selects of a UNION.  (This hasn't really got anything
> to do with whether a VIEW is involved.)  I haven't gotten round to
> convincing myself about whether that transformation is always valid,
> or what conditions it needs to be valid.  A TODO item for some
> future release...

Hmmm ... I'm pretty used an external WHERE clause being applied to the
output of the view, rather than pushed down into the member selects of
the UNION, in the same way as if the UNION query were a subselect.
Coming from a SQL Server background, I'd actually find the suggested
behavior rather confusing (as well as tough for you guys to implement).

-Josh



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