Minor fix to the ORDER BY elimination logic in generate_series().

FossilOrigin-Name: a2e50712fca9dff1b8d19631f792270c82da3c8696a5d9890cf0d1e13e950d60

test/tabfunc01.test

@@ -117,6 +117,34 @@ do_execsql_test tabfunc01-3.1 {
   SELECT DISTINCT value FROM generate_series(1,x), t1 ORDER BY 1;
 } {1 2 3}
 
+do_eqp_test tabfunc01-3.10 {
+  SELECT value FROM generate_series(1,10) ORDER BY value;
+} {
+  QUERY PLAN
+  `--SCAN generate_series VIRTUAL TABLE INDEX 19:
+}
+do_eqp_test tabfunc01-3.11 {
+  SELECT value FROM generate_series(1,10) ORDER BY +value;
+} {
+  QUERY PLAN
+  |--SCAN generate_series VIRTUAL TABLE INDEX 3:
+  `--USE TEMP B-TREE FOR ORDER BY
+}
+do_eqp_test tabfunc01-3.12 {
+  SELECT value FROM generate_series(1,10) ORDER BY value, stop;
+} {
+  QUERY PLAN
+  `--SCAN generate_series VIRTUAL TABLE INDEX 19:
+}
+do_eqp_test tabfunc01-3.13 {
+  SELECT value FROM generate_series(1,10) ORDER BY stop, value;
+} {
+  QUERY PLAN
+  |--SCAN generate_series VIRTUAL TABLE INDEX 3:
+  `--USE TEMP B-TREE FOR ORDER BY
+}
+
+
 # Eponymous virtual table exists in all schemas.
 #
 do_execsql_test tabfunc01-4.1 {