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Throw error if a <window definition> references a window that already has a

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frame clause, as appears to be required by the fine print in the SQL spec.
Per discussion with Pavel, not doing so risks user confusion.
This commit is contained in:
Tom Lane
2008-12-31 23:42:56 +00:00
parent eb273743ed
commit df0ea5a1cd
3 changed files with 29 additions and 14 deletions
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11
doc/src/sgml/ref/select.sgml
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@@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/ref/select.sgml,v 1.115 2008/12/31 00:08:35 tgl Exp $
$PostgreSQL: pgsql/doc/src/sgml/ref/select.sgml,v 1.116 2008/12/31 23:42:56 tgl Exp $
PostgreSQL documentation
-->
@@ -583,7 +583,7 @@ WINDOW <replaceable class="parameter">window_name</replaceable> AS ( <replaceabl
[ <replaceable class="parameter">existing_window_name</replaceable> ]
[ PARTITION BY <replaceable class="parameter">expression</replaceable> [, ...] ]
[ ORDER BY <replaceable class="parameter">expression</replaceable> [ ASC | DESC | USING <replaceable class="parameter">operator</replaceable> ] [ NULLS { FIRST | LAST } ] [, ...] ]
[ <replaceable class="parameter">framing_clause</replaceable> ]
[ <replaceable class="parameter">frame_clause</replaceable> ]
</synopsis>
</para>
@@ -594,7 +594,8 @@ WINDOW <replaceable class="parameter">window_name</replaceable> AS ( <replaceabl
as well as its ordering clause if any. In this case the new window cannot
specify its own <literal>PARTITION BY</> clause, and it can specify
<literal>ORDER BY</> only if the copied window does not have one.
The framing clause is never copied from the existing window.
The new window always uses its own frame clause; the copied window
must not specify a frame clause.
</para>
<para>
@@ -611,7 +612,7 @@ WINDOW <replaceable class="parameter">window_name</replaceable> AS ( <replaceabl
</para>
<para>
The optional <replaceable class="parameter">framing_clause</> defines
The optional <replaceable class="parameter">frame_clause</> defines
the <firstterm>window frame</> for window functions that depend on the
frame (not all do). It can be one of
<synopsis>
@@ -1486,7 +1487,7 @@ SELECT distributors.* WHERE distributors.name = 'Westward';
<para>
The SQL standard provides additional options for the window
<replaceable class="parameter">framing_clause</>.
<replaceable class="parameter">frame_clause</>.
<productname>PostgreSQL</productname> currently supports only the
options listed above.
</para>