Fix a faulty signed/unsigned character comparison in the LIKE optimization

logic.

FossilOrigin-Name: f4a4b1497355c1b27d3d0770550fffcc3b2d2d51ab284101f19e8fc4264ee675

manifest

@@ -1,5 +1,5 @@
-C Enhance\sthe\sCSV\svirtual\stable\sextension\sso\sthat\sit\saccepts\sthe\slast\srow\sof\nthe\sCSV\sfile\seven\sif\sthe\slast\srow\somits\sthe\sclosing\s\\n,\sas\slong\sas\sthe\slast\nrow\shas\sa\sfull\sset\sof\scolumns.
-D 2017-08-08T20:03:10.022
+C Fix\sa\sfaulty\ssigned/unsigned\scharacter\scomparison\sin\sthe\sLIKE\soptimization\nlogic.
+D 2017-08-08T21:30:43.624
 F Makefile.in d9873c9925917cca9990ee24be17eb9613a668012c85a343aef7e5536ae266e8
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 02b469e9dcd5b7ee63fc1fb05babc174260ee4cfa4e0ef2e48c3c6801567a016
@@ -537,7 +537,7 @@ F src/walker.c a7ca64ce08a83a20d32186fbe06bca9234e348cfcf07959ee322fdc3e8a6173a
 F src/where.c cbe8ddffbcec7ce86f7a800fe8fd10aee412c76c87e0dd3732a1682e68d74cd9
 F src/whereInt.h 93bb90b77d39901eda31b44d8e90da1351193ccfe96876f89b58a93a33b84c3d
 F src/wherecode.c e7be3b7f4c11908500cdf02b299d190d3742659533f58e0f4047962fdb5a48da
-F src/whereexpr.c 35d8b33afeedb8009fcd7211e1c848587578b345da93dbed69edc88dffe64c35
+F src/whereexpr.c 1e55d79174522fe3b9b7ab224ebedc03da6ec5e6d204d740fa73e71280f54574
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
 F test/affinity3.test 6a101af2fc945ce2912f6fe54dd646018551710d
@@ -1644,7 +1644,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P b26d7a1c7b5d59a2ceabc3716ccea32e26de729eb164a9c0e47f2d8f6ad3df37
-R 56b681b4bac4514f060903132d3e36f0
+P 537e3be2e9503183799afffcd91defc751fea2c779e9b77b77f9485f7de5d170
+R c0257e7418783a1dad51ec17553da8cb
 U drh
-Z ccaffe78aa350be9baaf3161acf84308
+Z eaaf23e57e1119f1d2e06b48f90e37e6

manifest.uuid

@@ -1 +1 @@
-537e3be2e9503183799afffcd91defc751fea2c779e9b77b77f9485f7de5d170
+f4a4b1497355c1b27d3d0770550fffcc3b2d2d51ab284101f19e8fc4264ee675

src/whereexpr.c

@@ -194,7 +194,7 @@ static int isLikeOrGlob(
   int *pisComplete, /* True if the only wildcard is % in the last character */
   int *pnoCase      /* True if uppercase is equivalent to lowercase */
 ){
-  const char *z = 0;         /* String on RHS of LIKE operator */
+  const u8 *z = 0;         /* String on RHS of LIKE operator */
   Expr *pRight, *pLeft;      /* Right and left size of LIKE operator */
   ExprList *pList;           /* List of operands to the LIKE operator */
   int c;                     /* One character in z[] */
@@ -221,12 +221,12 @@ static int isLikeOrGlob(
     int iCol = pRight->iColumn;
     pVal = sqlite3VdbeGetBoundValue(pReprepare, iCol, SQLITE_AFF_BLOB);
     if( pVal && sqlite3_value_type(pVal)==SQLITE_TEXT ){
-      z = (char *)sqlite3_value_text(pVal);
+      z = sqlite3_value_text(pVal);
     }
     sqlite3VdbeSetVarmask(pParse->pVdbe, iCol);
     assert( pRight->op==TK_VARIABLE || pRight->op==TK_REGISTER );
   }else if( op==TK_STRING ){
-    z = pRight->u.zToken;
+    z = (u8*)pRight->u.zToken;
   }
   if( z ){
 
@@ -269,7 +269,7 @@ static int isLikeOrGlob(
       *pisComplete = c==wc[0] && z[cnt+1]==0;
 
       /* Get the pattern prefix.  Remove all escapes from the prefix. */
-      pPrefix = sqlite3Expr(db, TK_STRING, z);
+      pPrefix = sqlite3Expr(db, TK_STRING, (char*)z);
       if( pPrefix ){
         int iFrom, iTo;
         char *zNew = pPrefix->u.zToken;