Fix a problem in which nested CTEs with the same table name trick the

code generator into thinking they are the same CTE, which then tries to
use the manifest them both into the same transient table.

FossilOrigin-Name: 202dd033019dd27428e3cc5f6e164c95b37efe39e2753515112b201ddefca67b

manifest

@@ -1,5 +1,5 @@
-C In\sthe\streeview\sdebugging\soutput,\s\nprovide\sadditional\sdetails\sfor\sthe\sTable\sobject\nassociated\swith\seach\sFROM\sclause\sterm.
-D 2018-12-27T00:30:42.080
+C Fix\sa\sproblem\sin\swhich\snested\sCTEs\swith\sthe\ssame\stable\sname\strick\sthe\ncode\sgenerator\sinto\sthinking\sthey\sare\sthe\ssame\sCTE,\swhich\sthen\stries\sto\nuse\sthe\smanifest\sthem\sboth\sinto\sthe\ssame\stransient\stable.
+D 2018-12-27T02:16:01.888
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in d8b254f8bb81bab43c340d70d17dc3babab40fcc8a348c8255881f780a45fee6
@@ -510,7 +510,7 @@ F src/printf.c 0f1177cf1dd4d7827bf64d840768514ec76409abecaca9e8b577dbd065150381
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 72fe8cae7326b979e7258ab4c531956951e1a5f3fe8644c646abaec1b2eb6d95
 F src/rowset.c d977b011993aaea002cab3e0bb2ce50cf346000dff94e944d547b989f4b1fe93
-F src/select.c 8c7317d5ee920516a56b8b4ca79fbfca70a1f8b52d67e884c808ea3a016c04e3
+F src/select.c c6a71c619db529e1af6b30d9ff59ec75dac2511f155e45bb6e49c07d9d5e79c0
 F src/shell.c.in 207da30342db0b6fac8b2487abd60b059a5ea80cc9494bd1db76a1dd4aae7cca
 F src/sqlite.h.in b54cd42d2f3b739a00de540cafe2dcd0de3b8e1748a2db33a68def487e9e602f
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
@@ -1675,7 +1675,7 @@ F test/window4.test c5d6bf3403e4ade2f19df2afe4c16f29fb817c392c6c1c8017edb7165c19
 F test/window5.test d328dd18221217c49c144181975eea17339eaeaf0e9aa558cee3afb84652821e
 F test/window6.test 5eae4ae7a590ccf1e605880969ca0bad3955616ac91cad3031baea38748badb3
 F test/windowfault.test 12ceb6bbb355d13e8fcd88c5731a57256dfdf77b9a7ae20842a76fcd4623df5b
-F test/with1.test 2465d98ffce80d00553ac7135697c18b0369275b6ecc750daa2af320b8c812ca
+F test/with1.test 64fcb1a81685b8a67da61af260a2d8f2afbf3530d39fa451831faf5a9ba6ea45
 F test/with2.test e0030e2f0267a910d6c0e4f46f2dfe941c1cc0d4f659ba69b3597728e7e8f1ab
 F test/with3.test 5e8ce2c585170bbbc0544e2a01a4941fa0be173ba5265e5c92eb588cd99a232d
 F test/with4.test 257be66c0c67fee1defbbac0f685c3465e2cad037f21ce65f23f86084f198205
@@ -1794,7 +1794,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 6821c61f1d71be2be7f867e59fd94582a1eaf45a4d1fb88be995807a77cc22ea
-R 4ea18b6b51fe2269e4e2378f67cdd93d
+P 11d4682d2eec133ccca99ca9cf2620cd249b4afe55918f3ebf93b454431f9c55
+R b977f91c4d7722c35c09931be1f3c206
 U drh
-Z 2cd0d162f6778292ed921cc2823ee931
+Z d4830dab28dbec43d7f7b026ad797e66

manifest.uuid

@@ -1 +1 @@
-11d4682d2eec133ccca99ca9cf2620cd249b4afe55918f3ebf93b454431f9c55
+202dd033019dd27428e3cc5f6e164c95b37efe39e2753515112b201ddefca67b

src/select.c

@@ -5466,14 +5466,19 @@ static struct SrcList_item *isSelfJoinView(
 ){
   struct SrcList_item *pItem;
   for(pItem = pTabList->a; pItem<pThis; pItem++){
+    Select *pS1;
     if( pItem->pSelect==0 ) continue;
     if( pItem->fg.viaCoroutine ) continue;
     if( pItem->zName==0 ) continue;
     if( sqlite3_stricmp(pItem->zDatabase, pThis->zDatabase)!=0 ) continue;
     if( sqlite3_stricmp(pItem->zName, pThis->zName)!=0 ) continue;
-    if( sqlite3ExprCompare(0, 
-          pThis->pSelect->pWhere, pItem->pSelect->pWhere, -1) 
-    ){
+    pS1 = pItem->pSelect;
+    if( pThis->pSelect->selId!=pS1->selId ){
+      /* The query flattener left two different CTE tables with identical
+      ** names in the same FROM clause. */
+      continue;
+    }
+    if( sqlite3ExprCompare(0, pThis->pSelect->pWhere, pS1->pWhere, -1) ){
       /* The view was modified by some other optimization such as
       ** pushDownWhereTerms() */
       continue;

test/with1.test

@@ -1044,4 +1044,23 @@ do_execsql_test 20.2 {
   WITH c(i)AS(VALUES(5)UNIoN SELECT 0)SELECT min(1)-i fROM c;
 } {1}
 
+# 2018-12-26
+# Two different CTE tables with the same name appear in within a single FROM
+# clause due to the query-flattener optimization.  make sure this does not cause
+# problems.  This problem was discovered by Matt Denton.
+#
+do_execsql_test 21.1 {
+   WITH RECURSIVE t21(a,b) AS (
+    WITH t21(x) AS (VALUES(1))
+    SELECT x, x FROM t21 ORDER BY 1
+  )
+  SELECT * FROM t21 AS tA, t21 AS tB
+} {1 1 1 1}
+do_execsql_test 21.2 {
+  SELECT printf('',
+     EXISTS (WITH RECURSIVE Table0 AS (WITH Table0 AS (SELECT DISTINCT 1)
+                                       SELECT *, * FROM Table0 ORDER BY 1 DESC)
+             SELECT * FROM Table0  NATURAL JOIN  Table0));
+} {{}}
+
 finish_test