Fix a problem in ALTER TABLE causing table or column references in sub-selects ton the RHS of a vector SET clause in an UPDATE within a trigger (i.e. "SET (a,b) = ( (SELECT...), <expr> )").

FossilOrigin-Name: 255b0eeed113d83b474efc5bc8fc790a270bc43ee598df4b2c378e1ad2d729b7

src/alter.c

@@ -831,6 +831,7 @@ static void renameWalkWith(Walker *pWalker, Select *pSelect){
       memset(&sNC, 0, sizeof(sNC));
       sNC.pParse = pParse;
       if( pCopy ) sqlite3SelectPrep(sNC.pParse, p, &sNC);
+      if( sNC.pParse->db->mallocFailed ) return;
       sqlite3WalkSelect(pWalker, p);
       sqlite3RenameExprlistUnmap(pParse, pWith->a[i].pCols);
     }

src/expr.c

@@ -518,7 +518,10 @@ Expr *sqlite3ExprForVectorField(
   }else{
     if( pVector->op==TK_VECTOR ) pVector = pVector->x.pList->a[iField].pExpr;
     pRet = sqlite3ExprDup(pParse->db, pVector, 0);
-    sqlite3RenameTokenRemap(pParse, pRet, pVector);
+    if( IN_RENAME_OBJECT && pRet ){
+      SWAP(Expr, *pRet, *pVector);
+      sqlite3RenameTokenRemap(pParse, pRet, pVector);
+    }
   }
   return pRet;
 }