Fix the VDBE so that it correctly handles the sequence of operations

OP_OpenEphemeral, OP_OpenDup, OP_OpenEphemeral, and OP_OpenDup in that
order on the same cursor.

FossilOrigin-Name: a1be6ee0188911448c064e2c25fb0ca1daad50f3d50fb49a34430bd09736b4a9

test/with3.test

@@ -173,5 +173,29 @@ do_execsql_test 4.1 {
     ); 
 } {1}
 
+# 2020-01-18 chrome ticket 1043236
+# Correct handling of the sequence:
+#    OP_OpenEphem
+#    OP_OpenDup
+#    Op_OpenEphem
+#    OP_OpenDup
+#
+do_execsql_test 4.2 {
+  SELECT (
+    WITH t1(a) AS (VALUES(1))
+    SELECT (
+      WITH t2(b) AS (
+        WITH t3(c) AS (
+          WITH t4(d) AS (VALUES('elvis'))
+          SELECT t4a.d FROM t4 AS t4a JOIN t4 AS t4b LEFT JOIN t4 AS t4c
+        )
+        SELECT c FROM t3 WHERE a = 1
+      )
+      SELECT t2a.b FROM t2 AS t2a JOIN t2 AS t2x
+    )
+    FROM t1 GROUP BY 1
+  )
+  GROUP BY 1;
+} {elvis}
 
 finish_test