Обсуждение: Views as FROM subselects

Tom, I see from the CVS logs you say:
Subselects in FROM clause, per ISO syntax: FROM (SELECT ...) [AS] alias.(Don't forget that an alias is required.)
Viewsreimplemented as expandingto subselect-in-FROM.  Grouping, aggregates, DISTINCT in views actuallywork now (he says
optimistically). No UNION support in subselects/viewsyet, but I have some ideas about that.  Rule-related permissions
checkingmovedout of rewriter and into executor.
 
Does this mean the rewrite system no longer handles views?

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Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Tom, I see from the CVS logs you say:
>  Subselects in FROM clause, per ISO syntax: FROM (SELECT ...) [AS] alias.
>  (Don't forget that an alias is required.)  Views reimplemented as expanding
>  to subselect-in-FROM.  Grouping, aggregates, DISTINCT in views actually
>  work now (he says optimistically).  No UNION support in subselects/views
>  yet, but I have some ideas about that.  Rule-related permissions checking
>  moved out of rewriter and into executor.
> Does this mean the rewrite system no longer handles views?

Sure it does.  It got a lot simpler though.
        regards, tom lane