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 <[email protected]>

1 files changed, 38 insertions, 0 deletions

diff --git a/src/bin/psql/describe.c b/src/bin/psql/describe.c
index 65d22f2b15..af803d75e5 100644
--- a/src/bin/psql/describe.c
+++ b/src/bin/psql/describe.c
@@ -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");