New assert()s to help verify union access. No logic changes. Testing and

validation code only.

FossilOrigin-Name: b7b64c53f5d7f6b405ee3f1f1be1d84230aa79db5a502c8ad78d3e524f4384fb

manifest

@@ -1,5 +1,5 @@
-C Fix\sharmless\scompiler\swarning\sin\sthe\svfstrace\sextension.
-D 2024-09-19T15:44:41.059
+C New\sassert()s\sto\shelp\sverify\sunion\saccess.\s\sNo\slogic\schanges.\s\sTesting\sand\nvalidation\scode\sonly.
+D 2024-09-20T12:58:15.340
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -716,7 +716,7 @@ F src/ctime.c b224d3db0f28c4a5f1407c50107a0a8133bd244ff3c7f6f8cedeb896a8cf1b64
 F src/date.c 89ce1ff20512a7fa5070ba6e7dd5c171148ca7d580955795bf97c79c2456144a
 F src/dbpage.c 12e49515d67d4a59625d71f9aa42499556cfdc2e4f1ea49086e674a7f47f46e5
 F src/dbstat.c 73362c0df0f40ad5523a6f5501224959d0976757b511299bf892313e79d14f5c
-F src/delete.c 444c4d1eaac40103461e3b6f0881846dd3aafc1cec1dd169d3482fa331667da7
+F src/delete.c 03a77ba20e54f0f42ebd8eddf15411ed6bdb06a2c472ac4b6b336521bf7cea42
 F src/expr.c 6d5f2c38fe3ec06a7eac599dac822788b36064124e20112a844e9cd5156cb239
 F src/fault.c 460f3e55994363812d9d60844b2a6de88826e007
 F src/fkey.c 928ed2517e8732113d2b9821aa37af639688d752f4ea9ac6e0e393d713eeb76f
@@ -765,7 +765,7 @@ F src/pragma.h e690a356c18e98414d2e870ea791c1be1545a714ba623719deb63f7f226d8bb7
 F src/prepare.c 3ba0ad907b7773ed642f66cea8a2c9c8edc18841aa1050b6218dbb3479e86225
 F src/printf.c 6a87534ebfb9e5346011191b1f3a7ebc457f5938c7e4feeea478ecf53f6a41b2
 F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
-F src/resolve.c 2c127880c0634962837f16f2f48a295e514357af959330cc038de73015d5b5e8
+F src/resolve.c b2cd748488012312824508639b6af908461e45403037d5c4e19d9b0e8195507f
 F src/rowset.c 8432130e6c344b3401a8874c3cb49fefe6873fec593294de077afea2dce5ec97
 F src/select.c 4b14337a2742f0c0beeba490e9a05507e9b4b12184b9cd12773501d08d48e3fe
 F src/shell.c.in 375f8a183126be96ec73db4e42c57917ff10a0900846b1b722dd4f8cef537812
@@ -840,19 +840,19 @@ F src/vacuum.c b763b6457bd058d2072ef9364832351fd8d11e8abf70cbb349657360f7d55c40
 F src/vdbe.c be5f58bc29f60252e041a618eae59e8d57d460ba136c5403cf0abf955560c457
 F src/vdbe.h c2549a215898a390de6669cfa32adba56f0d7e17ba5a7f7b14506d6fd5f0c36a
 F src/vdbeInt.h af7d7e8291edd0b19f2cd698e60e4d4031078f9a2f2328ac8f0b7efb134f8a1d
-F src/vdbeapi.c 483a391801ecacfeaa1d202c1d4dc2d7e520ba67566ca540868602117d6bdec5
+F src/vdbeapi.c 53c7e26a2c0821a892b20eee2cde4656e31998212f3d515576c780dfaa45fd17
 F src/vdbeaux.c 676dbee99b4febdd94bc9658667a2e3bc413c4c0e356242d90f98a1155d513e5
 F src/vdbeblob.c 255be187436da38b01f276c02e6a08103489bbe2a7c6c21537b7aecbe0e1f797
 F src/vdbemem.c df568ef0187e4be2788c35174f6d9b8566ab9475f9aff2d73907ed05aa5684b2
 F src/vdbesort.c d0a3c7056c081703c8b6d91ad60f17da5e062a5c64bf568ed0fa1b5f4cae311f
 F src/vdbetrace.c fe0bc29ebd4e02c8bc5c1945f1d2e6be5927ec12c06d89b03ef2a4def34bf823
 F src/vdbevtab.c fc46b9cbd759dc013f0b3724549cc0d71379183c667df3a5988f7e2f1bd485f3
-F src/vtab.c 5fb499d20494b7eecaadb7584634af9afcb374cb0524912b475fcb1712458a1b
+F src/vtab.c 316cd48e9320660db3047cd306cd056e4361180cebb4d0f10a39244e10c11422
 F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c ef68130ba330ee18c1cb22da36a881c82e3a3b109badbdc6a9b9acaf788a6688
 F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
 F src/walker.c d5006d6b005e4ea7302ad390957a8d41ed83faa177e412f89bc5600a7462a014
-F src/where.c 7fb55836eb7fd07f0a0d8400c50619fc02cda1f46a617cfb003c2990f040193d
+F src/where.c 461d41017d900d4248a268df96d2d30506c4dcc2257f4167c4f46072003ce2cf
 F src/whereInt.h a5d079c346a658b7a6e9e47bb943d021e02fa1e6aed3b964ca112112a4892192
 F src/wherecode.c 5172d647798134e7c92536ddffe7e530c393d79b5dedd648b88faf2646c65baf
 F src/whereexpr.c 44f41ae554c7572e1de1485b3169b233ee04d464b2ee5881687ede3bf07cacfa
@@ -2213,8 +2213,8 @@ F vsixtest/vsixtest.tcl 6195aba1f12a5e10efc2b8c0009532167be5e301abe5b31385638080
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 7b3a517b3e16ea487ca77a2c88a0c11d737de366524fc911aa1bdd6bfb7ad148
-R 8abdc1cdf80137783779f70c3d138da6
+P c8b4d092a22d87f1231424c8e3fa6a02f17fb965cb2a931621e1b51f4d215de7
+R a719963bd0139770f47d5fdf5d10ac23
 U drh
-Z c819f659938ee23a1835b141078e9e36
+Z 19717bb5d108ea5ef842c202f9af3f34
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-c8b4d092a22d87f1231424c8e3fa6a02f17fb965cb2a931621e1b51f4d215de7
+b7b64c53f5d7f6b405ee3f1f1be1d84230aa79db5a502c8ad78d3e524f4384fb

src/delete.c

@@ -75,6 +75,7 @@ void sqlite3CodeChangeCount(Vdbe *v, int regCounter, const char *zColName){
 **      is for a top-level SQL statement.
 */
 static int vtabIsReadOnly(Parse *pParse, Table *pTab){
+  assert( IsVirtual(pTab) );
   if( sqlite3GetVTable(pParse->db, pTab)->pMod->pModule->xUpdate==0 ){
     return 1;
   }

src/resolve.c

@@ -1119,8 +1119,8 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
     /* Resolve function names
     */
     case TK_FUNCTION: {
-      ExprList *pList = pExpr->x.pList;    /* The argument list */
-      int n = pList ? pList->nExpr : 0;    /* Number of arguments */
+      ExprList *pList;            /* The argument list */
+      int n;                      /* Number of arguments */
       int no_such_func = 0;       /* True if no such function exists */
       int wrong_num_args = 0;     /* True if wrong number of arguments */
       int is_agg = 0;             /* True if is an aggregate function */
@@ -1133,6 +1133,8 @@ static int resolveExprStep(Walker *pWalker, Expr *pExpr){
 #endif
       assert( !ExprHasProperty(pExpr, EP_xIsSelect|EP_IntValue) );
       assert( pExpr->pLeft==0 || pExpr->pLeft->op==TK_ORDER );
+      pList = pExpr->x.pList;
+      n = pList ? pList->nExpr : 0;
       zId = pExpr->u.zToken;
       pDef = sqlite3FindFunction(pParse->db, zId, n, enc, 0);
       if( pDef==0 ){

src/vdbeapi.c

@@ -2232,8 +2232,10 @@ int sqlite3_preupdate_old(sqlite3 *db, int iIdx, sqlite3_value **ppValue){
         if( p->apDflt==0 ) goto preupdate_old_out;
       }
       if( p->apDflt[iIdx]==0 ){
-        Expr *pDflt = p->pTab->u.tab.pDfltList->a[pCol->iDflt-1].pExpr;
         sqlite3_value *pVal = 0;
+        Expr *pDflt;
+        assert( p->pTab!=0 && IsOrdinaryTable(p->pTab) );
+        pDflt = p->pTab->u.tab.pDfltList->a[pCol->iDflt-1].pExpr;
         rc = sqlite3ValueFromExpr(db, pDflt, ENC(db), pCol->affinity, &pVal);
         if( rc==SQLITE_OK && pVal==0 ){
           rc = SQLITE_CORRUPT_BKPT;

src/vtab.c

@@ -867,6 +867,7 @@ int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable){
       Table *pNew = sParse.pNewTable;
       Index *pIdx;
       pTab->aCol = pNew->aCol;
+      assert( IsOrdinaryTable(pNew) );
       sqlite3ExprListDelete(db, pNew->u.tab.pDfltList);
       pTab->nNVCol = pTab->nCol = pNew->nCol;
       pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);

src/where.c

@@ -1636,9 +1636,11 @@ static void freeIndexInfo(sqlite3 *db, sqlite3_index_info *pIdxInfo){
 ** that this is required.
 */
 static int vtabBestIndex(Parse *pParse, Table *pTab, sqlite3_index_info *p){
-  sqlite3_vtab *pVtab = sqlite3GetVTable(pParse->db, pTab)->pVtab;
   int rc;
+  sqlite3_vtab *pVtab;
 
+  assert( IsVirtual(pTab) );
+  pVtab = sqlite3GetVTable(pParse->db, pTab)->pVtab;
   whereTraceIndexInfoInputs(p, pTab);
   pParse->db->nSchemaLock++;
   rc = pVtab->pModule->xBestIndex(pVtab, p);