Fix the LIKE optimization even when comparing mixed-case BLOBs.

FossilOrigin-Name: a58aafdb4e1422b6a8ffc07a67984928bbedf919

manifest

@@ -1,5 +1,5 @@
-C The\sLIKE\soptimization\smust\sbe\sapplied\stwice,\sonce\sfor\sstrings\sand\sa\ssecond\ntime\sfor\sBLOBs.\s\sTicket\s[05f43be8fdda9f].\s\sThis\scheck-in\sis\sa\sproof-of-concept\nof\show\sthat\smight\sbe\sdone.
+C Fix\sthe\sLIKE\soptimization\seven\swhen\scomparing\smixed-case\sBLOBs.
-D 2015-03-06T16:45:16.543
+D 2015-03-06T19:47:38.505
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 2f643d6968dfc0b82d2e546a0525a39079f9e928
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -307,8 +307,8 @@ F src/vxworks.h c18586c8edc1bddbc15c004fa16aeb1e1342b4fb
 F src/wal.c 39303f2c9db02a4e422cd8eb2c8760420c6a51fe
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c c253b95b4ee44b21c406e2a1052636c31ea27804
-F src/where.c b7e82341d2570ac8a051e133cfc44c7eec79a30e
+F src/where.c cace7eef1838ea22f549e824236eaaa4195b83e6
-F src/whereInt.h 0ba6257f2a44acd6262f259d5147cd01c52cc45b
+F src/whereInt.h cbe4aa57326998d89e7698ca65bb7c28541d483c
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
 F test/aggnested.test b35b4cd69fc913f90d39a575e171e1116c3a4bb7
@@ -1240,10 +1240,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 8c1e85aab9e0d90726057e25e2ea0663341c070f
+P 5757e803cb5759b476bbc6453c58340089611420
-R db06eec232964b57030b876196612d14
+R 1a18426c5e280ce5513288eef4bf379e
-T *branch * like-opt-fix
-T *sym-like-opt-fix *
-T -sym-trunk *
 U drh
-Z 9b71822fa0ca3d1b398ae4d623871060
+Z 4902bd060fa099614e1fc5278ee9e5b6

manifest.uuid

@@ -1 +1 @@
-5757e803cb5759b476bbc6453c58340089611420
+a58aafdb4e1422b6a8ffc07a67984928bbedf919

src/where.c

@@ -1264,9 +1264,25 @@ static void exprAnalyze(
     int idxNew1;
     int idxNew2;
     Token sCollSeqName;  /* Name of collating sequence */
+    const u16 wtFlags = TERM_LIKEOPT | TERM_VIRTUAL | TERM_DYNAMIC;
 
+    pTerm->wtFlags |= TERM_LIKE;
     pLeft = pExpr->x.pList->a[1].pExpr;
     pStr2 = sqlite3ExprDup(db, pStr1, 0);
+
+    /* Convert the lower bound to upper-case and the upper bound to
+    ** lower-case (upper-case is less than lower-case in ASCII) so that
+    ** the range constraints also work for BLOBs
+    */
+    if( noCase && !pParse->db->mallocFailed ){
+      int i;
+      char c;
+      for(i=0; (c = pStr1->u.zToken[i])!=0; i++){
+        pStr1->u.zToken[i] = sqlite3Toupper(c);
+        pStr2->u.zToken[i] = sqlite3Tolower(c);
+      }
+    }
+
     if( !db->mallocFailed ){
       u8 c, *pC;       /* Last character before the first wildcard */
       pC = (u8*)&pStr2->u.zToken[sqlite3Strlen30(pStr2->u.zToken)-1];
@@ -1290,8 +1306,7 @@ static void exprAnalyze(
            sqlite3ExprAddCollateToken(pParse,pNewExpr1,&sCollSeqName),
            pStr1, 0);
     transferJoinMarkings(pNewExpr1, pExpr);
-    idxNew1 = whereClauseInsert(pWC, pNewExpr1, 
+    idxNew1 = whereClauseInsert(pWC, pNewExpr1, wtFlags);
-                                TERM_LIKEOPT|TERM_VIRTUAL|TERM_DYNAMIC);
     testcase( idxNew1==0 );
     exprAnalyze(pSrc, pWC, idxNew1);
     pNewExpr2 = sqlite3ExprDup(db, pLeft, 0);
@@ -1299,8 +1314,7 @@ static void exprAnalyze(
            sqlite3ExprAddCollateToken(pParse,pNewExpr2,&sCollSeqName),
            pStr2, 0);
     transferJoinMarkings(pNewExpr2, pExpr);
-    idxNew2 = whereClauseInsert(pWC, pNewExpr2,
+    idxNew2 = whereClauseInsert(pWC, pNewExpr2, wtFlags);
-                                TERM_LIKEOPT|TERM_VIRTUAL|TERM_DYNAMIC);
     testcase( idxNew2==0 );
     exprAnalyze(pSrc, pWC, idxNew2);
     pTerm = &pWC->a[idxTerm];
@@ -2475,20 +2489,37 @@ static int whereInScanEst(
 ** but joins might run a little slower.  The trick is to disable as much
 ** as we can without disabling too much.  If we disabled in (1), we'd get
 ** the wrong answer.  See ticket #813.
+**
+** If all the children of a term are disabled, then that term is also
+** automatically disabled.  In this way, terms get disabled if derived
+** virtual terms are tested first.  For example:
+**
+**      x GLOB 'abc*' AND x>='abc' AND x<'acd'
+**      \___________/     \______/     \_____/
+**         parent          child1       child2
+**
+** Only the parent term was in the original WHERE clause.  The child1
+** and child2 terms were added by the LIKE optimization.  If both of
+** the virtual child terms are valid, then testing of the parent can be 
+** skipped.
 */
 static void disableTerm(WhereLevel *pLevel, WhereTerm *pTerm){
-  if( pTerm
+  int nLoop = 0;
+  while( pTerm
       && (pTerm->wtFlags & TERM_CODED)==0
       && (pLevel->iLeftJoin==0 || ExprHasProperty(pTerm->pExpr, EP_FromJoin))
       && (pLevel->notReady & pTerm->prereqAll)==0
   ){
+    if( nLoop && (pTerm->wtFlags & TERM_LIKE)!=0 ){
+      pTerm->wtFlags |= TERM_LIKECOND;
+    }else{
       pTerm->wtFlags |= TERM_CODED;
-    if( pTerm->iParent>=0 ){
-      WhereTerm *pOther = &pTerm->pWC->a[pTerm->iParent];
-      if( (--pOther->nChild)==0 ){
-        disableTerm(pLevel, pOther);
-      }
     }
+    if( pTerm->iParent<0 ) break;
+    pTerm = &pTerm->pWC->a[pTerm->iParent];
+    pTerm->nChild--;
+    if( pTerm->nChild!=0 ) break;
+    nLoop++;
   }
 }
 
@@ -3807,6 +3838,7 @@ static Bitmask codeOneLoopStart(
   */
   for(pTerm=pWC->a, j=pWC->nTerm; j>0; j--, pTerm++){
     Expr *pE;
+    int skipLikeAddr = 0;
     testcase( pTerm->wtFlags & TERM_VIRTUAL );
     testcase( pTerm->wtFlags & TERM_CODED );
     if( pTerm->wtFlags & (TERM_VIRTUAL|TERM_CODED) ) continue;
@@ -3821,7 +3853,13 @@ static Bitmask codeOneLoopStart(
     if( pLevel->iLeftJoin && !ExprHasProperty(pE, EP_FromJoin) ){
       continue;
     }
+    if( pTerm->wtFlags & TERM_LIKECOND ){
+      assert( pLevel->iLikeRepCntr>0 );
+      skipLikeAddr = sqlite3VdbeAddOp1(v, OP_IfZero, pLevel->iLikeRepCntr);
+      VdbeCoverage(v);
+    }
     sqlite3ExprIfFalse(pParse, pE, addrCont, SQLITE_JUMPIFNULL);
+    if( skipLikeAddr ) sqlite3VdbeJumpHere(v, skipLikeAddr);
     pTerm->wtFlags |= TERM_CODED;
   }
 

src/whereInt.h

@@ -277,7 +277,9 @@ struct WhereTerm {
 #else
 #  define TERM_VNULL    0x00   /* Disabled if not using stat3 */
 #endif
-#define TERM_LIKEOPT    0x100  /* Used by the LIKE optimization */
+#define TERM_LIKEOPT    0x100  /* Virtual terms from the LIKE optimization */
+#define TERM_LIKECOND   0x200  /* Conditionally this LIKE operator term */
+#define TERM_LIKE       0x400  /* The original LIKE operator */
 
 /*
 ** An instance of the WhereScan object is used as an iterator for locating