Make psql \d on a sequence show the table/column owning it

diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 43c9ce4297b234df0a8c5d084e758a98bbf2b462..8ec240d09ebd4f9c9442926015b71ce94f979bbd 100644 (file)
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -1609,6 +1609,43 @@ describeOneTableDetails(const char *schemaname,
                        PQclear(result);
                }
        }
+       else if (tableinfo.relkind == 'S')
+       {
+               /* Footer information about a sequence */
+               PGresult   *result = NULL;
+
+               /* Get the column that owns this sequence */
+               printfPQExpBuffer(&buf, "SELECT pg_catalog.quote_ident(nspname) || '.' ||"
+                                                 "\n   pg_catalog.quote_ident(relname) || '.' ||"
+                                                 "\n   pg_catalog.quote_ident(attname)"
+                                                 "\nFROM pg_catalog.pg_class c"
+                                                 "\nINNER JOIN pg_catalog.pg_depend d ON c.oid=d.refobjid"
+                                                 "\nINNER JOIN pg_catalog.pg_namespace n ON n.oid=c.relnamespace"
+                                                 "\nINNER JOIN pg_catalog.pg_attribute a ON ("
+                                                 "\n a.attrelid=c.oid AND"
+                                                 "\n a.attnum=d.refobjsubid)"
+                                                 "\nWHERE d.classid='pg_catalog.pg_class'::pg_catalog.regclass"
+                                                 "\n AND d.refclassid='pg_catalog.pg_class'::pg_catalog.regclass"
+                                                 "\n AND d.objid=%s"
+                                                 "\n AND d.deptype='a'",
+                                                 oid);
+
+               result = PSQLexec(buf.data, false);
+               if (!result)
+                       goto error_return;
+               else if (PQntuples(result) == 1)
+               {
+                       printfPQExpBuffer(&buf, _("Owned by: %s"),
+                                                         PQgetvalue(result, 0, 0));
+                       printTableAddFooter(&cont, buf.data);
+               }
+               /*
+                * If we get no rows back, don't show anything (obviously).
+                * We should never get more than one row back, but if we do,
+                * just ignore it and don't print anything.
+                */
+               PQclear(result);
+       }
        else if (tableinfo.relkind == 'r' || tableinfo.relkind == 'f')
        {
                /* Footer information about a table */