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>

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");