Incremental check-in with various NGQP fixes. Many tests still fail.

FossilOrigin-Name: a51d8c92496436488e1a6eabd85785e8fedf2736

manifest

@@ -1,5 +1,5 @@
-C Futher\ssimplifications\sto\sthe\sNGQP.\s\sFix\ssome\stest\scases\sto\suse\nEXPLAIN\sQUERY\sPLAN\srather\sthan\sthe\s(now\sobsolete)\ssqlite_query_plan\nglobal\svariable.
-D 2013-05-30T19:29:19.963
+C Incremental\scheck-in\swith\svarious\sNGQP\sfixes.\s\sMany\stests\sstill\sfail.
+D 2013-05-30T22:27:09.004
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5e41da95d92656a5004b03d3576e8b226858a28e
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -289,7 +289,7 @@ F src/vtab.c b05e5f1f4902461ba9f5fc49bb7eb7c3a0741a83
 F src/wal.c 436bfceb141b9423c45119e68e444358ee0ed35d
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c 4fa43583d0a84b48f93b1e88f11adf2065be4e73
-F src/where.c 3e9b7b3323f78ec3056c5e3aa3443661bc590054
+F src/where.c 28e0cefe34698b6de4e6f5484cd987ae993c49f2
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
 F test/aggnested.test 45c0201e28045ad38a530b5a144b73cd4aa2cfd6
@@ -1093,7 +1093,7 @@ F tool/vdbe-compress.tcl f12c884766bd14277f4fcedcae07078011717381
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh fbc018d67fd7395f440c28f33ef0f94420226381
 F tool/win/sqlite.vsix 97894c2790eda7b5bce3cc79cb2a8ec2fde9b3ac
-P a3b4e261bd7e278f150872cce7b020af5ad8d2ed
-R b028bf2657ab598aee5d4698a0488fdc
+P ae985db4fa08b5efbef5a834e852f0b05101264b
+R 5e6d0ab71af5f0e6d4eac06636af5d1b
 U drh
-Z 3432943259d0f5aa9c669ba0e80caf85
+Z 130160475bcddf72f5447461f586642a

manifest.uuid

@@ -1 +1 @@
-ae985db4fa08b5efbef5a834e852f0b05101264b
+a51d8c92496436488e1a6eabd85785e8fedf2736

src/where.c

@@ -3183,8 +3183,7 @@ static Bitmask codeOneLoopStart(
       sqlite3VdbeAddOp3(v, testOp, memEndValue, addrBrk, iRowidReg);
       sqlite3VdbeChangeP5(v, SQLITE_AFF_NUMERIC | SQLITE_JUMPIFNULL);
     }
-  }else if( pLoop->wsFlags & (WHERE_COLUMN_RANGE | WHERE_COLUMN_NULL |
-                              WHERE_COLUMN_EQ | WHERE_IDX_ONLY) ){
+  }else if( pLoop->wsFlags & WHERE_INDEXED ){
     /* Case 4: A scan using an index.
     **
     **         The WHERE clause may contain zero or more equality 
@@ -3425,7 +3424,8 @@ static Bitmask codeOneLoopStart(
       pLevel->op = OP_Next;
     }
     pLevel->p1 = iIdxCur;
-    if( pLoop->wsFlags & WHERE_COVER_SCAN ){
+    if( (pLoop->wsFlags & (WHERE_COLUMN_EQ | WHERE_COLUMN_RANGE | 
+                          WHERE_COLUMN_NULL | WHERE_COLUMN_IN))==0 ){
       pLevel->p5 = SQLITE_STMTSTATUS_FULLSCAN_STEP;
     }else{
       assert( pLevel->p5==0 );
@@ -3875,6 +3875,18 @@ static int whereLoopInsert(WhereLoopBuilder *pBuilder, WhereLoop *pTemplate){
   */
   for(ppPrev=&pWInfo->pLoops, p=*ppPrev; p; ppPrev=&p->pNextLoop, p=*ppPrev){
     if( p->iTab!=pTemplate->iTab || p->iSortIdx!=pTemplate->iSortIdx ) continue;
+    if( p->nTerm<pTemplate->nTerm
+     && (p->wsFlags & WHERE_INDEXED)!=0
+     && (pTemplate->wsFlags & WHERE_INDEXED)!=0
+     && p->u.btree.pIndex==pTemplate->u.btree.pIndex
+     && p->prereq==pTemplate->prereq
+    ){
+      /* Overwrite an existing WhereLoop with an similar one that uses
+      ** more terms of the index */
+      pNext = p->pNextLoop;
+      whereLoopClear(db, p);
+      break;
+    }
     if( (p->prereq & pTemplate->prereq)==p->prereq
      && p->rSetup<=pTemplate->rSetup
      && p->rRun<=pTemplate->rRun
@@ -4590,7 +4602,10 @@ static int wherePathSatisfiesOrderBy(
         iColumn = -1;
         revIdx = 0;
       }
-      if( pOBExpr->iColumn!=iColumn ) return 0;
+      if( pOBExpr->iColumn!=iColumn ){
+        if( j<pLoop->u.btree.nEq ){ nUsed--; continue; }
+        return 0;
+      }
       if( iColumn>=0 ){
         pColl = sqlite3ExprCollSeq(pWInfo->pParse, pOrderBy->a[nUsed].pExpr);
         if( !pColl ) pColl = db->pDfltColl;