A different approach to the autoindex problem that deletes query-planner code

rather than adding it.

FossilOrigin-Name: f270fb6e9e0b5e77f918081962008c6195ab1e36

ext/rtree/rtree6.test

@@ -102,7 +102,7 @@ do_eqp_test rtree6.2.4.2 {
   SELECT * FROM t1,t2 WHERE v=10 and x1<10 and x2>10
 } {
   0 0 0 {SCAN TABLE t1 VIRTUAL TABLE INDEX 2:C0E1} 
-  0 1 1 {SCAN TABLE t2}
+  0 1 1 {SEARCH TABLE t2 USING AUTOMATIC COVERING INDEX (v=?)}
 }
 
 do_eqp_test rtree6.2.5 {

manifest

@@ -1,5 +1,5 @@
-C Simplification\sto\sthe\slogic\sthat\sprevents\sautomatic\sindexes\sfrom\sbeing\sformed\non\sconstant\sexpressions.
+C A\sdifferent\sapproach\sto\sthe\sautoindex\sproblem\sthat\sdeletes\squery-planner\scode\nrather\sthan\sadding\sit.
-D 2014-06-17T09:52:26.975
+D 2014-06-17T12:33:55.348
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in ed5e4aae4799f724699d5509fac2977786414dbb
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -129,7 +129,7 @@ F ext/rtree/rtree2.test acbb3a4ce0f4fbc2c304d2b4b784cfa161856bba
 F ext/rtree/rtree3.test a494da55c30ee0bc9b01a91c80c81b387b22d2dc
 F ext/rtree/rtree4.test c8fe384f60ebd49540a5fecc990041bf452eb6e0
 F ext/rtree/rtree5.test 6a510494f12454bf57ef28f45bc7764ea279431e
-F ext/rtree/rtree6.test 83a997caf27eeca990291f66277e5a136428479a
+F ext/rtree/rtree6.test 0cfbdf27ee086bf16a3da2c6f2d5b3d6473cb27e
 F ext/rtree/rtree7.test 1fa710b9e6bf997a0c1a537b81be7bb6fded1971
 F ext/rtree/rtree8.test db79c812f9e4a11f9b1f3f9934007884610a713a
 F ext/rtree/rtree9.test d86ebf08ff6328895613ed577dd8a2a37c472c34
@@ -296,7 +296,7 @@ F src/vtab.c 21b932841e51ebd7d075e2d0ad1415dce8d2d5fd
 F src/wal.c 264df50a1b33124130b23180ded2e2c5663c652a
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c 11edb74d587bc87b33ca96a5173e3ec1b8389e45
-F src/where.c 3214e390ca5ff0b19fb5084e5bd5870da623389d
+F src/where.c cd3110c7dca304ecbdf2ed07b23205e90b10475b
 F src/whereInt.h 929c1349b5355fd44f22cee5c14d72b3329c58a6
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1177,7 +1177,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 58acc2a8b38c5f13175c191697b4d2b663db1872
+P 36d67e1dd2b4f4c22d02f3c3b8d372074de5523a
-R 91ed31168e6ce0a5afee4b984323de5e
+R f31fb5c411bc798b3e39eb24696f39dc
 U drh
-Z ee443673993fc3ea86368d30ccfb6dad
+Z d63276e1ce6bb05efdbf1c4b12bc995b

manifest.uuid

@@ -1 +1 @@
-36d67e1dd2b4f4c22d02f3c3b8d372074de5523a
+f270fb6e9e0b5e77f918081962008c6195ab1e36

src/where.c

@@ -4529,7 +4529,6 @@ static int whereLoopAddBtree(
     WhereTerm *pWCEnd = pWC->a + pWC->nTerm;
     for(pTerm=pWC->a; rc==SQLITE_OK && pTerm<pWCEnd; pTerm++){
       if( pTerm->prereqRight & pNew->maskSelf ) continue;
-      if( sqlite3ExprIsConstant(pTerm->pExpr->pRight) ) continue;
       if( termCanDriveIndex(pTerm, pSrc, 0) ){
         pNew->u.btree.nEq = 1;
         pNew->u.btree.nSkip = 0;
@@ -5279,7 +5278,6 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
   LogEst rCost;             /* Cost of a path */
   LogEst nOut;              /* Number of outputs */
   LogEst mxCost = 0;        /* Maximum cost of a set of paths */
-  LogEst mxOut = 0;         /* Maximum nOut value on the set of paths */
   int nTo, nFrom;           /* Number of valid entries in aTo[] and aFrom[] */
   WherePath *aFrom;         /* All nFrom paths at the previous level */
   WherePath *aTo;           /* The nTo best paths at the current level */
@@ -5389,8 +5387,6 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
         for(jj=0, pTo=aTo; jj<nTo; jj++, pTo++){
           if( pTo->maskLoop==maskNew
            && ((pTo->isOrdered^isOrdered)&80)==0
-           && ((pTo->rCost<=rCost && pTo->nRow<=nOut) ||
-                (pTo->rCost>=rCost && pTo->nRow>=nOut))
           ){
             testcase( jj==nTo-1 );
             break;
@@ -5424,7 +5420,7 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
           }
 #endif
         }else{
-          if( pTo->rCost<=rCost && pTo->nRow<=nOut ){
+          if( pTo->rCost<=rCost ){
 #ifdef WHERETRACE_ENABLED /* 0x4 */
             if( sqlite3WhereTrace&0x4 ){
               sqlite3DebugPrintf(
@@ -5464,11 +5460,9 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
         if( nTo>=mxChoice ){
           mxI = 0;
           mxCost = aTo[0].rCost;
-          mxOut = aTo[0].nRow;
           for(jj=1, pTo=&aTo[1]; jj<mxChoice; jj++, pTo++){
-            if( pTo->rCost>mxCost || (pTo->rCost==mxCost && pTo->nRow>mxOut) ){
+            if( pTo->rCost>mxCost ){
               mxCost = pTo->rCost;
-              mxOut = pTo->nRow;
               mxI = jj;
             }
           }