diff options
| -rw-r--r-- | doc/src/sgml/ddl.sgml | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml index ea840fb8468..e52dff2dd52 100644 --- a/doc/src/sgml/ddl.sgml +++ b/doc/src/sgml/ddl.sgml @@ -2964,11 +2964,11 @@ ANALYZE measurement; <listitem> <para> Constraint exclusion only works when the query's <literal>WHERE</> - clause contains constants. A parameterized query will not be - optimized, since the planner cannot know which partitions the - parameter value might select at run time. For the same reason, - <quote>stable</> functions such as <function>CURRENT_DATE</function> - must be avoided. + clause contains constants (or externally supplied parameters). + For example, a comparison against a non-immutable function such as + <function>CURRENT_TIMESTAMP</function> cannot be optimized, since the + planner cannot know which partition the function value might fall + into at run time. </para> </listitem> |