Coverage testing of the OP_SeekScan opcode. Fix a problem that comes up when

OP_SeekScan reaches the end of the table.

FossilOrigin-Name: 9e57e758a6a33f54d28a546b4eebfb5cfacef30dc4e0207e43bb9d2c06fc3439

manifest

@@ -1,5 +1,5 @@
-C Improved\scomments\son\sthe\snew\sOP_SeekScan\sopcode.
+C Coverage\stesting\sof\sthe\sOP_SeekScan\sopcode.\s\sFix\sa\sproblem\sthat\scomes\sup\swhen\nOP_SeekScan\sreaches\sthe\send\sof\sthe\stable.
-D 2020-09-29T17:29:11.276
+D 2020-09-29T20:22:20.000
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -607,7 +607,7 @@ F src/upsert.c 2920de71b20f04fe25eb00b655d086f0ba60ea133c59d7fa3325c49838818e78
 F src/utf.c ee39565f0843775cc2c81135751ddd93eceb91a673ea2c57f61c76f288b041a0
 F src/util.c c0c7977de7ef9b8cb10f6c85f2d0557889a658f817b0455909a49179ba4c8002
 F src/vacuum.c 492422c1463c076473bae1858799c7a0a5fe87a133d1223239447c422cd26286
-F src/vdbe.c f1dfd1fc1911876ac8ade2d1e9c3055242ec9de857fc7f72c9c75f712e6acde3
+F src/vdbe.c a5f9dbd62905ce5f7fde94c4b6e9d24eeb0e1844a4f352d7ce7b447bad62afcb
 F src/vdbe.h 83603854bfa5851af601fc0947671eb260f4363e62e960e8a994fb9bbcd2aaa1
 F src/vdbeInt.h 3ca5e9fd6e095a8b6cf6bc3587a46fc93499503b2fe48951e1034ba9e2ce2f6e
 F src/vdbeapi.c c5e7cb2ab89a24d7f723e87b508f21bfb1359a04db5277d8a99fd1e015c12eb9
@@ -624,7 +624,7 @@ F src/wal.h c3aa7825bfa2fe0d85bef2db94655f99870a285778baa36307c0a16da32b226a
 F src/walker.c 3df26a33dc4f54e8771600fb7fdebe1ece0896c2ad68c30ab40b017aa4395049
 F src/where.c da9c0d503f81cc8444eb3525b75eec2bb3d198f4d5939b207977f2fc20d85b54
 F src/whereInt.h 59077fbd0b3d01bc8715e746c86a99ebf4c85bde8a57077ec04d2a23e59666ec
-F src/wherecode.c 89d14a834b48b9ead4415024a79a4895a3d4363b37e377a487479e9ed59118db
+F src/wherecode.c 8d5e5973bcb5348877ac07ec85fb98cc3bb3b3377b79845cb39b3e812194cc47
 F src/whereexpr.c 2a05552e808047a93845278c98c6ca64a265fa8e9ffd087c161bb11bfe339866
 F src/window.c edd6f5e25a1e8f2b6f5305b7f5f7da7bb35f07f0d432b255b1d4c2fcab4205aa
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
@@ -1880,7 +1880,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 2206a2c848a122ee220c89427f9be0460cba0706f58852139d7b37184ce29a29
+P 6110fdd5bb7b4ae5c065404c802ae726362ef084966b73cffe58c4bfb98689d2
-R 1f20d571e0b39b4a04d29411b17457a4
+R 5208a223b9abbea3e3bc1a7c83370262
 U drh
-Z fc780e21a0f22dec17fca15dd256ba17
+Z 4e19dcf82e793fd815f6f64707a372c6

manifest.uuid

@@ -1 +1 @@
-6110fdd5bb7b4ae5c065404c802ae726362ef084966b73cffe58c4bfb98689d2
+9e57e758a6a33f54d28a546b4eebfb5cfacef30dc4e0207e43bb9d2c06fc3439

src/vdbe.c

@@ -4477,28 +4477,47 @@ case OP_SeekScan: {
     rc = sqlite3VdbeIdxKeyCompare(db, pC, &r, &res);
     if( rc ) goto abort_due_to_error;
     if( res>0 ){
+      seekscan_search_fail:
 #ifdef SQLITE_DEBUG
-     if( db->flags&SQLITE_VdbeTrace ){
+      if( db->flags&SQLITE_VdbeTrace ){
-       printf("... %d steps and then skip\n", pOp->p1 - n);
+        printf("... %d steps and then skip\n", pOp->p1 - n);
-     }        
+      }        
 #endif
       pOp++;
+      VdbeBranchTaken(1,3);
       goto jump_to_p2;
     }
     if( res==0 ){
 #ifdef SQLITE_DEBUG
-     if( db->flags&SQLITE_VdbeTrace ){
+      if( db->flags&SQLITE_VdbeTrace ){
-       printf("... %d steps and then success\n", pOp->p1 - n);
+        printf("... %d steps and then success\n", pOp->p1 - n);
-     }        
+      }        
 #endif
       pOp += 2;
+      VdbeBranchTaken(2,3);
+      break;
+    }
+    if( n<=0 ){
+#ifdef SQLITE_DEBUG
+      if( db->flags&SQLITE_VdbeTrace ){
+        printf("... fall through after %d steps\n", pOp->p1);
+      }        
+#endif
+      VdbeBranchTaken(0,3);
       break;
     }
-    if( n<=0 ) break;
     n--;
     rc = sqlite3BtreeNext(pC->uc.pCursor, 0);
-    if( rc ) goto abort_due_to_error;
+    if( rc ){
+      if( rc==SQLITE_DONE ){
+        rc = SQLITE_OK;
+        goto seekscan_search_fail;
+      }else{
+        goto abort_due_to_error;
+      }
+    }
   }
+  
   break;
 }
 

src/wherecode.c

@@ -1807,7 +1807,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
       if( (pLoop->wsFlags & WHERE_IN_SEEKSCAN)!=0 ){
         assert( op==OP_SeekGE );
         assert( regBignull==0 );
-        sqlite3VdbeAddOp1(v, OP_SeekScan, 10);
+        sqlite3VdbeAddOp1(v, OP_SeekScan, 10);  VdbeCoverage(v);
       }
       sqlite3VdbeAddOp4Int(v, op, iIdxCur, addrNxt, regBase, nConstraint);
       VdbeCoverage(v);