diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/config.sgml | 20 | ||||
| -rw-r--r-- | doc/src/sgml/fdwhandler.sgml | 20 |
2 files changed, 40 insertions, 0 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index c13f60230f9..b012a269911 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -3632,6 +3632,26 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class=" </listitem> </varlistentry> + <varlistentry id="guc-enable-partition-wise-join" xreflabel="enable_partition_wise_join"> + <term><varname>enable_partition_wise_join</varname> (<type>boolean</type>) + <indexterm> + <primary><varname>enable_partition_wise_join</> configuration parameter</primary> + </indexterm> + </term> + <listitem> + <para> + Enables or disables the query planner's use of partition-wise join, + which allows a join between partitioned tables to be performed by + joining the matching partitions. Partition-wise join currently applies + only when the join conditions include all the partition keys, which + must be of the same data type and have exactly matching sets of child + partitions. Because partition-wise join planning can use significantly + more CPU time and memory during planning, the default is + <literal>off</>. + </para> + </listitem> + </varlistentry> + <varlistentry id="guc-enable-seqscan" xreflabel="enable_seqscan"> <term><varname>enable_seqscan</varname> (<type>boolean</type>) <indexterm> diff --git a/doc/src/sgml/fdwhandler.sgml b/doc/src/sgml/fdwhandler.sgml index a59e03af98b..e63e29fd96f 100644 --- a/doc/src/sgml/fdwhandler.sgml +++ b/doc/src/sgml/fdwhandler.sgml @@ -1292,6 +1292,26 @@ ShutdownForeignScan(ForeignScanState *node); </para> </sect2> + <sect2 id="fdw-callbacks-reparameterize-paths"> + <title>FDW Routines For reparameterization of paths</title> + + <para> +<programlisting> +List * +ReparameterizeForeignPathByChild(PlannerInfo *root, List *fdw_private, + RelOptInfo *child_rel); +</programlisting> + This function is called while converting a path parameterized by the + top-most parent of the given child relation <literal>child_rel</> to be + parameterized by the child relation. The function is used to reparameterize + any paths or translate any expression nodes saved in the given + <literal>fdw_private</> member of a <structname>ForeignPath</>. The + callback may use <literal>reparameterize_path_by_child</>, + <literal>adjust_appendrel_attrs</> or + <literal>adjust_appendrel_attrs_multilevel</> as required. + </para> + </sect2> + </sect1> <sect1 id="fdw-helpers"> |