Reason why set-value functions not allowed in GREATEST(), etc?

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От Hitoshi Harada
Тема Reason why set-value functions not allowed in GREATEST(), etc?
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Msg-id e08cc0401002220925t3d93001cq429e00e8fcaf58b8@mail.gmail.com
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Ответы Re: Reason why set-value functions not allowed in GREATEST(), etc?  (Pavel Stehule <pavel.stehule@gmail.com>)
Re: Reason why set-value functions not allowed in GREATEST(), etc?  (Tom Lane <tgl@sss.pgh.pa.us>)
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I just wonder why generate_series() is not allowed in GREATEST syntax.
Looking through execQual.c,  almost all syntactic evaluations like
COALESCE, ARRAY[], ROW() doesn't allow set-value functions. Could
someone tell the underlying reason?

Also, using variadic functions introduced since 8.4, I hope we can
remove the special syntax cases for them by replacing them with normal
variadic functions. Is it sane idea?

Regards,

-- 
Hitoshi Harada

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