doc: mention inheritance's tableoid can be used in partitioning

Previously tableoid was not mentioned in the partition doc section.  We
only had a link to the "all the normal rules" of inheritance section.

Reported-by: michal.palenik@freemap.sk
Discussion: https://postgr.es/m/162627031219.693.11508199541771263335@wrigleys.postgresql.org

Backpatch-through: 10

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index 6cb179728d7d6d7c77d7e7cd8c93655a0db1ef7b..8d44ab430136f58867b949239b3b75641138aa02 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -3090,7 +3090,8 @@ VALUES ('Albany', NULL, NULL, 'NY');
     That means partitioned tables and partitions do not participate in
     inheritance with regular tables.  Since a partition hierarchy consisting
     of the partitioned table and its partitions is still an inheritance
-    hierarchy, all the normal rules of inheritance apply as described in
+    hierarchy, <structfield>tableoid</structfield> and all the normal rules
+    of inheritance apply as described in
     <xref linkend="ddl-inherit"> with some exceptions, most notably:
 
     <itemizedlist>