diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/queries.sgml | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml index 372cce1a487..a326960ff4d 100644 --- a/doc/src/sgml/queries.sgml +++ b/doc/src/sgml/queries.sgml @@ -1461,10 +1461,10 @@ GROUP BY GROUPING SETS ( <para> When multiple window functions are used, all the window functions having - syntactically equivalent <literal>PARTITION BY</literal> and <literal>ORDER BY</literal> - clauses in their window definitions are guaranteed to be evaluated in a - single pass over the data. Therefore they will see the same sort ordering, - even if the <literal>ORDER BY</literal> does not uniquely determine an ordering. + equivalent <literal>PARTITION BY</literal> and <literal>ORDER BY</literal> + clauses in their window definitions are guaranteed to see the same + ordering of the input rows, even if the <literal>ORDER BY</literal> does + not uniquely determine the ordering. However, no guarantees are made about the evaluation of functions having different <literal>PARTITION BY</literal> or <literal>ORDER BY</literal> specifications. (In such cases a sort step is typically required between the passes of |