doc: Clarify that pg_attrdef also stores generation expressions

This was documented with pg_attribute but not with pg_attrdef.

Reported-by: jian he 
Discussion: https://www.postgresql.org/message-id/CACJufxE+E-iYmBnZVZHiYA+WpyZZVv7BfiBLpo=T70EZHDU9rw@mail.gmail.com

diff --git a/doc/src/sgml/catalogs.sgml b/doc/src/sgml/catalogs.sgml
index dd61e057b21b27e3cf68e08da6a4a804f3e359a4..b654fae1b2f60389929a01519a7c3273047cc15e 100644 (file)
--- a/doc/src/sgml/catalogs.sgml
+++ b/doc/src/sgml/catalogs.sgml
@@ -1032,10 +1032,11 @@
 
   
    The catalog pg_attrdef stores column default
-   values.  The main information about columns is stored in
-   pg_attribute.
-   Only columns for which a default value has been explicitly set will have
-   an entry here.
+   expressions and generation expressions.  The main information about columns
+   is stored in 
+   linkend="catalog-pg-attribute">pg_attribute.
+   Only columns for which a default expression or generation expression has
+   been explicitly set will have an entry here.
   
 
   @@ -1087,7 +1088,7 @@        adbin pg_node_tree              -       The column default value, in nodeToString()+       The column default or generation expression, in nodeToString()        representation.  Use pg_get_expr(adbin, adrelid) to        convert it to an SQL expression.       
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