| From: | Andrew Gierth <andrew(at)tao11(dot)riddles(dot)org(dot)uk> |
|---|---|
| To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Cc: | Jeff Davis <pgsql(at)j-davis(dot)com>, "David G(dot) Johnston" <david(dot)g(dot)johnston(at)gmail(dot)com>, Stephen Frost <sfrost(at)snowman(dot)net>, Nicholas White <n(dot)j(dot)white(at)gmail(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Robert Haas <robertmhaas(at)gmail(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Troels Nielsen <bn(dot)troels(at)gmail(dot)com>, Hitoshi Harada <umi(dot)tanuki(at)gmail(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "pgsql-hackers\(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: Request for Patch Feedback: Lag & Lead Window Functions Can Ignore Nulls |
| Date: | 2016-05-30 14:44:27 |
| Message-ID: | 87bn3n62da.fsf@news-spur.riddles.org.uk |
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| Lists: | pgsql-hackers |
>>>>> "Dean" == Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
Dean> That may be so, but we already support FILTER for all windows
Dean> functions as well as aggregates:
Not so:
"If FILTER is specified, then only the input rows for which the
filter_clause evaluates to true are fed to the window function; other
rows are discarded. Only window functions that are aggregates accept a
FILTER clause."
(Per spec, FILTER appears only in the <aggregate function> production,
which is just one of the several options for <window function>.)
--
Andrew (irc:RhodiumToad)
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