Add further tests for new window function functionality.

FossilOrigin-Name: 1fbddf01b1c3fff95b05e2f2f709754e2b514296060b4846518791e7161d9ddb

test/windowerr.tcl

@@ -38,6 +38,8 @@ foreach {tn frame} {
   6 "ORDER BY a GROUPS BETWEEN  1 PRECEDING AND -1 FOLLOWING"
 
   7 "ORDER BY a,b RANGE BETWEEN  1 PRECEDING AND 1 FOLLOWING"
+
+  8 "PARTITION BY a RANGE BETWEEN  1 PRECEDING AND 1 FOLLOWING"
 } {
   errorsql_test 1.$tn "
   SELECT a, sum(b) OVER (

test/windowerr.test

@@ -79,4 +79,11 @@ do_test 1.7 { catch { execsql {
   ) FROM t1 ORDER BY 1
 } } } 1
 
+# PG says ERROR:  RANGE with offset PRECEDING/FOLLOWING requires exactly one ORDER BY column
+do_test 1.8 { catch { execsql {
+  SELECT a, sum(b) OVER (
+    PARTITION BY a RANGE BETWEEN  1 PRECEDING AND 1 FOLLOWING
+  ) FROM t1 ORDER BY 1
+} } } 1
+
 finish_test