Fix an ALTER TABLE problem with handling infinite loops of CTEs in th…

…e database schema.

FossilOrigin-Name: c09d90eec2a49b948c60971294d146db5c82438855cd3fa48ddc3d2e6b44c26c

manifest

@@ -1,5 +1,5 @@
-C Fix\sa\stest\sscript\sproblem\sin\scorruptN.test.
-D 2021-06-14T14:52:27.395
+C Fix\san\sALTER\sTABLE\sproblem\swith\shandling\sinfinite\sloops\sof\sCTEs\sin\sthe\sdatabase\sschema.
+D 2021-06-14T20:08:48.007
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -478,7 +478,7 @@ F spec.template 86a4a43b99ebb3e75e6b9a735d5fd293a24e90ca
 F sqlite.pc.in 42b7bf0d02e08b9e77734a47798d1a55a9e0716b
 F sqlite3.1 fc7ad8990fc8409983309bb80de8c811a7506786
 F sqlite3.pc.in 48fed132e7cb71ab676105d2a4dc77127d8c1f3a
-F src/alter.c da02319df16f58f4a86c1b4a7c171ccb87cbee33f408545cff8fe12ac2fc4336
+F src/alter.c 961d8e65f15b089daa05d9e628890922ba9d41f00253abc8797c4f8a01841eb3
 F src/analyze.c 01c6c6765cb4d40b473b71d85535093730770bb186f2f473abac25f07fcdee5c
 F src/attach.c a514e81758ba7b3a3a0501faf70af6cfc509de8810235db726cfc9f25165e929
 F src/auth.c 08954fdc4cc2da5264ba5b75cfd90b67a6fc7d1710a02ccf917c38eadec77853
@@ -544,12 +544,12 @@ F src/printf.c 78fabb49b9ac9a12dd1c89d744abdc9b67fd3205e62967e158f78b965a29ec4b
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 35630effd4d16d2373caa41bae40a3d71f853f3ad0cb4f572f2ed4b8c350c1e9
 F src/rowset.c ba9515a922af32abe1f7d39406b9d35730ed65efab9443dc5702693b60854c92
-F src/select.c 371cf15116b20b236f099c15daafd2ab6ef4bba43a263100aef60506f25cb3ff
+F src/select.c 4fa607bab6bcc580f12dbaf9c800b2250a1e408f10321a1d3bcb1dd30c447e62
 F src/shell.c.in 586493be0d3a2fc1e6803577d683697dfefc0fb305cc966bb389ce4045cbc19d
 F src/sqlite.h.in f450394634eac00bc680c0e91582b818359c6ad61149f49f90fb6ecbd526b51f
 F src/sqlite3.rc 5121c9e10c3964d5755191c80dd1180c122fc3a8
 F src/sqlite3ext.h 61b38c073d5e1e96a3d45271b257aef27d0d13da2bea5347692ae579475cd95e
-F src/sqliteInt.h 30723f0f0528d080951270df667182d84f3a3bf7e0d4942007c4d38468042359
+F src/sqliteInt.h ab37a8dd95884fc25ef1eb7b6d53d6674905c67298affc2b5bf947f739096504
 F src/sqliteLimit.h d7323ffea5208c6af2734574bae933ca8ed2ab728083caa117c9738581a31657
 F src/status.c 4b8bc2a6905163a38b739854a35b826c737333fab5b1f8e03fa7eb9a4799c4c1
 F src/table.c 0f141b58a16de7e2fbe81c308379e7279f4c6b50eb08efeec5892794a0ba30d1
@@ -658,7 +658,7 @@ F test/altermalloc.test 167a47de41b5c638f5f5c6efb59784002b196fff70f98d9b4ed3cd74
 F test/altermalloc2.test ca3ebc01670d9313953a2b7628d8cc00dc5ea9988f229b3cbbbe1cca506dae45
 F test/altermalloc3.test 059841a3de6b6780efd9f0b30bf1d9b4443c555f68d39975cbcac2583167b239
 F test/alterqf.test 67568ad152db8c1187b15633b801242cf960f1beafc51261a3d1725d910baeb2
-F test/altertab.test 4120b9b2baa96ef2b0aaf4dd46b1858171503edf5e346b5ce939c73b4d314fa6
+F test/altertab.test 466b9757630d68455080690b6e99c5ff11b199df4b3530e17f3df10a63aa05d3
 F test/altertab2.test b0d62f323ca5dab42b0bc028c52e310ebdd13e655e8fac070fe622bad7852c2b
 F test/altertab3.test 2b82fa2236a3a91553d53ae5555d8e723c7eec174c41f1fa62ff497355398479
 F test/amatch1.test b5ae7065f042b7f4c1c922933f4700add50cdb9f
@@ -1918,7 +1918,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 791473bc6677c2ae76f558082a4b43ca1eaf9895b76624d5b55d58f2af898ff3
-R 1ec73471740d8ca9cec873343ba25025
+P 3ddfe9ae55e6d0d922fbc209768b2ac4a4792f0f63af9a8fb53d66a4b8f1d94b
+R 6fd809181a9d25f2bff2632e26c04c9c
 U dan
-Z 3165e89d56a12ef29c6e244373f60df3
+Z bdbdcc00e7e6c9d7dc2a086e308522a2

manifest.uuid

@@ -1 +1 @@
-3ddfe9ae55e6d0d922fbc209768b2ac4a4792f0f63af9a8fb53d66a4b8f1d94b
+c09d90eec2a49b948c60971294d146db5c82438855cd3fa48ddc3d2e6b44c26c

src/alter.c

@@ -850,7 +850,11 @@ static int renameUnmapSelectCb(Walker *pWalker, Select *p){
   Parse *pParse = pWalker->pParse;
   int i;
   if( pParse->nErr ) return WRC_Abort;
-  if( p->selFlags & SF_View ) return WRC_Prune;
+  if( p->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( pSelect->selFlags & SF_View );
+    testcase( pSelect->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
   if( ALWAYS(p->pEList) ){
     ExprList *pList = p->pEList;
     for(i=0; i<pList->nExpr; i++){
@@ -958,7 +962,11 @@ static RenameToken *renameTokenFind(
 ** descend into sub-select statements.
 */
 static int renameColumnSelectCb(Walker *pWalker, Select *p){
-  if( p->selFlags & SF_View ) return WRC_Prune;
+  if( p->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( pSelect->selFlags & SF_View );
+    testcase( pSelect->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
   renameWalkWith(pWalker, p);
   return WRC_Continue;
 }
@@ -1594,7 +1602,11 @@ static int renameTableSelectCb(Walker *pWalker, Select *pSelect){
   int i;
   RenameCtx *p = pWalker->u.pRename;
   SrcList *pSrc = pSelect->pSrc;
-  if( pSelect->selFlags & SF_View ) return WRC_Prune;
+  if( pSelect->selFlags & (SF_View|SF_CopyCte) ){
+    testcase( pSelect->selFlags & SF_View );
+    testcase( pSelect->selFlags & SF_CopyCte );
+    return WRC_Prune;
+  }
   if( NEVER(pSrc==0) ){
     assert( pWalker->pParse->db->mallocFailed );
     return WRC_Abort;

src/select.c

@@ -5208,6 +5208,7 @@ static int resolveFromTermToCte(
     pTab->tabFlags |= TF_Ephemeral | TF_NoVisibleRowid;
     pFrom->pSelect = sqlite3SelectDup(db, pCte->pSelect, 0);
     if( db->mallocFailed ) return 2;
+    pFrom->pSelect->selFlags |= SF_CopyCte;
     assert( pFrom->pSelect );
     pFrom->fg.isCte = 1;
     pFrom->u2.pCteUse = pCteUse;

src/sqliteInt.h

@@ -3213,6 +3213,7 @@ struct Select {
 #define SF_UpdateFrom    0x0800000 /* Statement is an UPDATE...FROM */
 #define SF_PushDown      0x1000000 /* SELECT has be modified by push-down opt */
 #define SF_MultiPart     0x2000000 /* Has multiple incompatible PARTITIONs */
+#define SF_CopyCte       0x4000000 /* SELECT statement is a copy of a CTE */
 
 /*
 ** The results of a SELECT can be distributed in several ways, as defined

test/altertab.test

@@ -949,4 +949,23 @@ do_execsql_test 30.2 {
   END}
 }
 
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 31.0 {
+  CREATE TABLE t1(q);
+  CREATE VIEW vvv AS WITH x AS (WITH y AS (SELECT * FROM x) SELECT 1) SELECT 1;
+}
+
+do_execsql_test 31.1 {
+  SELECT * FROM vvv;
+} {1}
+
+do_execsql_test 31.2 {
+  ALTER TABLE t1 RENAME TO t1x;
+}
+
+do_execsql_test 31.3 {
+  ALTER TABLE t1x RENAME q TO x;
+}
+
 finish_test