Fix some problems to do with OOM conditions in vdbesort.c. Some problems remain.

FossilOrigin-Name: 2f94f9ce9bf11f1599bbc640b3fc8c15da588416

test/sortfault.test

@@ -0,0 +1,40 @@
+# 2014 March 25.
+#
+# The author disclaims copyright to this source code.  In place of
+# a legal notice, here is a blessing:
+#
+#    May you do good and not evil.
+#    May you find forgiveness for yourself and forgive others.
+#    May you share freely, never taking more than you give.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library. 
+#
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix sortfault
+
+
+do_execsql_test 1.0 {
+  PRAGMA cache_size = 5;
+}
+
+do_faultsim_test 1 -prep {
+  sqlite3 db test.db
+} -body {
+  execsql { 
+    WITH r(x,y) AS (
+      SELECT 1, randomblob(1000)
+      UNION ALL
+      SELECT x+1, randomblob(1000) FROM r
+      LIMIT 500
+    )
+    SELECT count(x), length(y) FROM r GROUP BY (x%5)
+  } 
+} -test {
+  faultsim_test_result {0 {100 1000 100 1000 100 1000 100 1000 100 1000}}
+}
+
+finish_test
+