Have \d show child tables that inherit from the specified parent

As per discussion, \d shows only the number of child tables, because that
could be hundreds, when used for partitioning.  \d+ shows the actual list.

Author: Damien Clochard <damien@dalibo.info>

diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index cde2428259dd0468465c7488c29a00451a98a67a..751af1c3792d6489e8f2e8f6679517297328b952 100644 (file)
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -8,7 +8,7 @@
  *
  * Copyright (c) 2000-2009, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.218 2009/06/13 13:43:34 petere Exp $
+ * $PostgreSQL: pgsql/src/bin/psql/describe.c,v 1.219 2009/07/03 18:56:50 petere Exp $
  */
 #include "postgres_fe.h"
 
@@ -1814,6 +1814,44 @@ describeOneTableDetails(const char *schemaname,
                }
                PQclear(result);
 
+               /* print child tables */
+               printfPQExpBuffer(&buf, "SELECT c.oid::pg_catalog.regclass FROM pg_catalog.pg_class c, pg_catalog.pg_inherits i WHERE c.oid=i.inhrelid AND i.inhparent = '%s' ORDER BY c.oid::pg_catalog.regclass;", oid);
+
+               result = PSQLexec(buf.data, false);
+               if (!result)
+                       goto error_return;
+               else
+                       tuples = PQntuples(result);
+
+               if (!verbose)
+               {
+                       /* print the number of child tables, if any */
+                       if (tuples > 0)
+                       {
+                               printfPQExpBuffer(&buf, _("Number of child tables: %d (Use \\d+ to list them.)"), tuples);
+                               printTableAddFooter(&cont, buf.data);
+                       }
+               }
+               else
+               {
+                       /* display the list of child tables*/
+                       for (i = 0; i < tuples; i++)
+                       {
+                               const char *ct = _("Child tables");
+
+                               if (i == 0)
+                                       printfPQExpBuffer(&buf, "%s: %s", ct, PQgetvalue(result, i, 0));
+                               else
+                                       printfPQExpBuffer(&buf, "%*s  %s", (int) strlen(ct), "", PQgetvalue(result, i, 0));
+                               if (i < tuples - 1)
+                                       appendPQExpBuffer(&buf, ",");
+
+                               printTableAddFooter(&cont, buf.data);
+                       }
+               }
+               PQclear(result);
+
+               /* OIDs and options */
                if (verbose)
                {
                        const char *s = _("Has OIDs");