<para>
See <xref linkend="fdw-planning"> for additional information.
</para>
-
- <para>
-<programlisting>
-void
-GetExistingLocalJoinPath(RelOptInfo *joinrel)
-</programlisting>
- The function returns copy of a local join path, which can be converted
- into an alternative local join plan, which may be useful when
- implementing a <literal>RecheckForeignScan</> method. The function
- searches for an unparameterized path in the <literal>pathlist</> of given
- <literal>joinrel</>. If it does not find such a path, it returns NULL, in
- which case a foreign data wrapper may build the local path by itself or
- may choose not to create access paths for that join.
- </para>
-
</sect2>
<sect2 id="fdw-callbacks-update">
can be executed and the resulting tuple can be stored in the slot.
This plan need not be efficient since no base table will return more
than one row; for example, it may implement all joins as nested loops.
- <literal>GetExistingLocalJoinPath</> may be used to search existing paths
- for a suitable local join path, which can be used as the alternative
- local join plan.
+ The function <literal>GetExistingLocalJoinPath</> may be used to search
+ existing paths for a suitable local join path, which can be used as the
+ alternative local join plan. <literal>GetExistingLocalJoinPath</>
+ searches for an unparameterized path in the path list of the specified
+ join relation. (If it does not find such a path, it returns NULL, in
+ which case a foreign data wrapper may build the local path by itself or
+ may choose not to create access paths for that join.)
</para>
</sect2>