*/
  n = sqlite4_value_int(argv[0]);
  sqlite4_result_text(context, sqlite4_compileoption_get(n), -1,
                      SQLITE4_STATIC, 0);
}
#endif /* SQLITE4_OMIT_COMPILEOPTION_DIAGS */

/* Array for converting from half-bytes (nybbles) into ASCII hex
** digits. */
static const char hexdigits[] = {
  '0', '1', '2', '3', '4', '5', '6', '7',
  '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' 
};

/*
** EXPERIMENTAL - This is not an official function.  The interface may
** change.  This function may disappear.  Do not write code that depends
** on this function.
**
** Implementation of the QUOTE() function.  This function takes a single
** argument.  If the argument is numeric, the return value is the same as
................................................................................
    case SQLITE4_FLOAT: {
      sqlite4_result_value(context, argv[0]);
      break;
    }
    case SQLITE4_BLOB: {
      int nBlob;
      char *zText = 0;
      char const *zBlob = sqlite4_value_blob(argv[0], &nBlob);
      zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4); 
      if( zText ){
        int i;
        for(i=0; i<nBlob; i++){
          zText[(i*2)+2] = hexdigits[(zBlob[i]>>4)&0x0F];
          zText[(i*2)+3] = hexdigits[(zBlob[i])&0x0F];
        }
        zText[(nBlob*2)+2] = '\'';
        zText[(nBlob*2)+3] = '\0';
        zText[0] = 'x';
        zText[1] = '\'';
        sqlite4_result_text(context, zText, -1, SQLITE4_TRANSIENT, 0);
        sqlite4_free(sqlite4_context_env(context), zText);
      }
      break;
    }
    case SQLITE4_TEXT: {
      int i,j;
................................................................................
static void hexFunc(
  sqlite4_context *context,
  int argc,
  sqlite4_value **argv
){
  int i, n;
  const unsigned char *pBlob;
  char *zHex, *z;
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  pBlob = sqlite4_value_blob(argv[0], &n);
  z = zHex = contextMalloc(context, ((i64)n)*2 + 1);
  if( zHex ){
    for(i=0; i<n; i++, pBlob++){
      unsigned char c = *pBlob;
      *(z++) = hexdigits[(c>>4)&0xf];
      *(z++) = hexdigits[c&0xf];
    }
    *z = 0;
    sqlite4_result_text(context, zHex, n*2, SQLITE4_DYNAMIC, 0);
  }
}

/*
** The replace() function.  Three arguments are all strings: call
** them A, B, and C. The result is also a string which is derived

  */
  n = sqlite4_value_int(argv[0]);
  sqlite4_result_text(context, sqlite4_compileoption_get(n), -1,
                      SQLITE4_STATIC, 0);
}
#endif /* SQLITE4_OMIT_COMPILEOPTION_DIAGS */








/*
** EXPERIMENTAL - This is not an official function.  The interface may
** change.  This function may disappear.  Do not write code that depends
** on this function.
**
** Implementation of the QUOTE() function.  This function takes a single
** argument.  If the argument is numeric, the return value is the same as
................................................................................
    case SQLITE4_FLOAT: {
      sqlite4_result_value(context, argv[0]);
      break;
    }
    case SQLITE4_BLOB: {
      int nBlob;
      char *zText = 0;
      const char *zBlob = sqlite4_value_blob(argv[0], &nBlob);
      zText = (char *)contextMalloc(context, (2*(i64)nBlob)+4); 
      if( zText ){
        zText[0] = 'x';
        zText[1] = '\'';
        sqlite4BlobToHex(nBlob, (const u8*)zBlob, zText+2);


        zText[(nBlob*2)+2] = '\'';
        zText[(nBlob*2)+3] = 0;


        sqlite4_result_text(context, zText, -1, SQLITE4_TRANSIENT, 0);
        sqlite4_free(sqlite4_context_env(context), zText);
      }
      break;
    }
    case SQLITE4_TEXT: {
      int i,j;
................................................................................
static void hexFunc(
  sqlite4_context *context,
  int argc,
  sqlite4_value **argv
){
  int i, n;
  const unsigned char *pBlob;
  char *zHex;
  assert( argc==1 );
  UNUSED_PARAMETER(argc);
  pBlob = sqlite4_value_blob(argv[0], &n);
  zHex = contextMalloc(context, ((i64)n)*2 + 1);
  if( zHex ){
    sqlite4BlobToHex(n, (const u8*)pBlob, zHex);





    sqlite4_result_text(context, zHex, n*2, SQLITE4_DYNAMIC, 0);
  }
}

/*
** The replace() function.  Three arguments are all strings: call
** them A, B, and C. The result is also a string which is derived

      }else if( pIdx->nCover>0 ){
        int nByte = sizeof(int)*pIdx->nCover;
        int *aiPermute = (int *)sqlite4DbMallocRaw(pParse->db, nByte);

        if( aiPermute ){
          memcpy(aiPermute, pIdx->aiCover, nByte);
          sqlite4VdbeAddOp4(

              v, OP_Permutation, 0, 0, 0, (char*)aiPermute, P4_INTARRAY
          );
        }
        regData = regCover;
        sqlite4VdbeAddOp3(v, OP_MakeRecord, regContent, pIdx->nCover, regData);
      }
      sqlite4VdbeAddOp3(v, OP_IdxInsert, baseCur+i, regData, aRegIdx[i]);
      sqlite4VdbeChangeP5(v, flags);

      }else if( pIdx->nCover>0 ){
        int nByte = sizeof(int)*pIdx->nCover;
        int *aiPermute = (int *)sqlite4DbMallocRaw(pParse->db, nByte);

        if( aiPermute ){
          memcpy(aiPermute, pIdx->aiCover, nByte);
          sqlite4VdbeAddOp4(
              v, OP_Permutation, pIdx->nCover, 0, 0,
              (char*)aiPermute, P4_INTARRAY
          );
        }
        regData = regCover;
        sqlite4VdbeAddOp3(v, OP_MakeRecord, regContent, pIdx->nCover, regData);
      }
      sqlite4VdbeAddOp3(v, OP_IdxInsert, baseCur+i, regData, aRegIdx[i]);
      sqlite4VdbeChangeP5(v, flags);

#define FLAG_STRING  4     /* Allow infinity precision */


/*
** The following table is searched linearly, so it is good to put the
** most frequently used conversion types first.
*/
static const char aDigits[] = "0123456789ABCDEF0123456789abcdef";
static const char aPrefix[] = "-x0\000X0";
static const et_info fmtinfo[] = {
  {  'd', 10, 1, etRADIX,      0,  0 },
  {  's',  0, 4, etSTRING,     0,  0 },
  {  'g',  0, 1, etGENERIC,    30, 0 },
  {  'z',  0, 4, etDYNSTRING,  0,  0 },
  {  'q',  0, 4, etSQLESCAPE,  0,  0 },
  {  'Q',  0, 4, etSQLESCAPE2, 0,  0 },
  {  'w',  0, 4, etSQLESCAPE3, 0,  0 },
  {  'c',  0, 0, etCHARX,      0,  0 },
  {  'o',  8, 0, etRADIX,      0,  2 },
  {  'u', 10, 0, etRADIX,      0,  0 },
  {  'x', 16, 0, etRADIX,      16, 1 },
  {  'X', 16, 0, etRADIX,      0,  4 },
#ifndef SQLITE4_OMIT_FLOATING_POINT
  {  'f',  0, 1, etFLOAT,      0,  0 },
  {  'e',  0, 1, etEXP,        30, 0 },
  {  'E',  0, 1, etEXP,        14, 0 },
  {  'G',  0, 1, etGENERIC,    14, 0 },
#endif
  {  'i', 10, 1, etRADIX,      0,  0 },
  {  'n',  0, 0, etSIZE,       0,  0 },
  {  '%',  0, 0, etPERCENT,    0,  0 },
  {  'p', 16, 0, etPOINTER,    0,  1 },

/* All the rest have the FLAG_INTERN bit set and are thus for internal
................................................................................
void sqlite4XPrintf(StrAccum *p, const char *zFormat, ...){
  va_list ap;
  va_start(ap,zFormat);
  sqlite4VXPrintf(p, 1, zFormat, ap);
  va_end(ap);
}
#endif

#define FLAG_STRING  4     /* Allow infinity precision */


/*
** The following table is searched linearly, so it is good to put the
** most frequently used conversion types first.
*/
static const char aDigits[] = "0123456789abcdef0123456789ABCDEF";
static const char aPrefix[] = "-x0\000X0";
static const et_info fmtinfo[] = {
  {  'd', 10, 1, etRADIX,      0,  0 },
  {  's',  0, 4, etSTRING,     0,  0 },
  {  'g',  0, 1, etGENERIC,    14, 0 },
  {  'z',  0, 4, etDYNSTRING,  0,  0 },
  {  'q',  0, 4, etSQLESCAPE,  0,  0 },
  {  'Q',  0, 4, etSQLESCAPE2, 0,  0 },
  {  'w',  0, 4, etSQLESCAPE3, 0,  0 },
  {  'c',  0, 0, etCHARX,      0,  0 },
  {  'o',  8, 0, etRADIX,      0,  2 },
  {  'u', 10, 0, etRADIX,      0,  0 },
  {  'x', 16, 0, etRADIX,      0,  1 },
  {  'X', 16, 0, etRADIX,      16, 4 },
#ifndef SQLITE4_OMIT_FLOATING_POINT
  {  'f',  0, 1, etFLOAT,      0,  0 },
  {  'e',  0, 1, etEXP,        14, 0 },
  {  'E',  0, 1, etEXP,        30, 0 },
  {  'G',  0, 1, etGENERIC,    30, 0 },
#endif
  {  'i', 10, 1, etRADIX,      0,  0 },
  {  'n',  0, 0, etSIZE,       0,  0 },
  {  '%',  0, 0, etPERCENT,    0,  0 },
  {  'p', 16, 0, etPOINTER,    0,  1 },

/* All the rest have the FLAG_INTERN bit set and are thus for internal
................................................................................
void sqlite4XPrintf(StrAccum *p, const char *zFormat, ...){
  va_list ap;
  va_start(ap,zFormat);
  sqlite4VXPrintf(p, 1, zFormat, ap);
  va_end(ap);
}
#endif

/*
** Convert an N-byte blob into hex.  The caller is responsible for making
** sure zOut contains at least N*2+1 bytes of usable space.
*/
void sqlite4BlobToHex(int N, const u8 *zIn, char *zOut){
  while( (N--)>0 ){
    u8 c = *(zIn++);
    *(zOut++) = aDigits[c>>4];
    *(zOut++) = aDigits[c&0x0f];
  }
  *zOut = 0;
}

  sqlite4VdbeAddOp2(v, OP_Gosub, regAddrB, addrSelectB);
  sqlite4VdbeAddOp2(v, OP_If, regEofA, addrEofA);
  sqlite4VdbeAddOp2(v, OP_If, regEofB, addrEofB);

  /* Implement the main merge loop
  */
  sqlite4VdbeResolveLabel(v, labelCmpr);
  sqlite4VdbeAddOp4(v, OP_Permutation, 0, 0, 0, (char*)aPermute, P4_INTARRAY);

  sqlite4VdbeAddOp4(v, OP_Compare, destA.iMem, destB.iMem, nOrderBy,
                         (char*)pKeyMerge, P4_KEYINFO_HANDOFF);
  sqlite4VdbeAddOp3(v, OP_Jump, addrAltB, addrAeqB, addrAgtB);

  /* Jump to the this point in order to terminate the query.
  */
  sqlite4VdbeResolveLabel(v, labelEnd);

  sqlite4VdbeAddOp2(v, OP_Gosub, regAddrB, addrSelectB);
  sqlite4VdbeAddOp2(v, OP_If, regEofA, addrEofA);
  sqlite4VdbeAddOp2(v, OP_If, regEofB, addrEofB);

  /* Implement the main merge loop
  */
  sqlite4VdbeResolveLabel(v, labelCmpr);
  sqlite4VdbeAddOp4(v, OP_Permutation, nOrderBy, 0, 0,
                    (char*)aPermute, P4_INTARRAY);
  sqlite4VdbeAddOp4(v, OP_Compare, destA.iMem, destB.iMem, nOrderBy,
                         (char*)pKeyMerge, P4_KEYINFO_HANDOFF);
  sqlite4VdbeAddOp3(v, OP_Jump, addrAltB, addrAeqB, addrAgtB);

  /* Jump to the this point in order to terminate the query.
  */
  sqlite4VdbeResolveLabel(v, labelEnd);

  int sqlite4IsNaN(double);
  int sqlite4IsInf(double);
#else
# define sqlite4IsNaN(X)  0
# define sqlite4IsInf(X)  0
#endif


void sqlite4VXPrintf(StrAccum*, int, const char*, va_list);
#ifndef SQLITE4_OMIT_TRACE
void sqlite4XPrintf(StrAccum*, const char*, ...);
#endif
char *sqlite4MPrintf(sqlite4*,const char*, ...);
char *sqlite4VMPrintf(sqlite4*,const char*, va_list);
char *sqlite4MAppendf(sqlite4*,char*,const char*,...);

  int sqlite4IsNaN(double);
  int sqlite4IsInf(double);
#else
# define sqlite4IsNaN(X)  0
# define sqlite4IsInf(X)  0
#endif

void sqlite4BlobToHex(int, const u8*, char*);
void sqlite4VXPrintf(StrAccum*, int, const char*, va_list);
#ifndef SQLITE4_OMIT_TRACE
void sqlite4XPrintf(StrAccum*, const char*, ...);
#endif
char *sqlite4MPrintf(sqlite4*,const char*, ...);
char *sqlite4VMPrintf(sqlite4*,const char*, va_list);
char *sqlite4MAppendf(sqlite4*,char*,const char*,...);

  /* Undo any changes made by applyAffinity() to the input registers. */
  pIn1->flags = (pIn1->flags&~MEM_TypeMask) | (flags1&MEM_TypeMask);
  pIn3->flags = (pIn3->flags&~MEM_TypeMask) | (flags3&MEM_TypeMask);
  break;
}

/* Opcode: Permutation * * * P4 *
**
** Set the permutation used by the OP_Compare operator to be the array
** of integers in P4.

**
** The permutation is only valid until the next OP_Permutation, OP_Compare,
** OP_Halt, or OP_ResultRow.  Typically the OP_Permutation should occur
** immediately prior to the OP_Compare.
*/
case OP_Permutation: {
  assert( pOp->p4type==P4_INTARRAY );

  /* Undo any changes made by applyAffinity() to the input registers. */
  pIn1->flags = (pIn1->flags&~MEM_TypeMask) | (flags1&MEM_TypeMask);
  pIn3->flags = (pIn3->flags&~MEM_TypeMask) | (flags3&MEM_TypeMask);
  break;
}

/* Opcode: Permutation P1 * * P4 *
**
** Set the permutation used by the OP_Compare operator to be the array
** of integers in P4.  P4 will contain exactly P1 elements.  The P1
** parameter is used only for printing the P4 array when debugging.
**
** The permutation is only valid until the next OP_Permutation, OP_Compare,
** OP_Halt, or OP_ResultRow.  Typically the OP_Permutation should occur
** immediately prior to the OP_Compare.
*/
case OP_Permutation: {
  assert( pOp->p4type==P4_INTARRAY );

    case P4_VTAB: {
      sqlite4_vtab *pVtab = pOp->p4.pVtab->pVtab;
      sqlite4_snprintf(zTemp, nTemp, "vtab:%p:%p", pVtab, pVtab->pModule);
      break;
    }
#endif
    case P4_INTARRAY: {

      sqlite4_snprintf(zTemp, nTemp, "intarray");






      break;
    }
    case P4_SUBPROGRAM: {
      sqlite4_snprintf(zTemp, nTemp, "program");
      break;
    }
    case P4_ADVANCE: {
      zTemp[0] = 0;
      break;
    }
    default: {









      zP4 = pOp->p4.z;
      if( zP4==0 ){
        zP4 = zTemp;
        zTemp[0] = 0;

      }
    }
  }
  assert( zP4!=0 );
  return zP4;
}
#endif

    case P4_VTAB: {
      sqlite4_vtab *pVtab = pOp->p4.pVtab->pVtab;
      sqlite4_snprintf(zTemp, nTemp, "vtab:%p:%p", pVtab, pVtab->pModule);
      break;
    }
#endif
    case P4_INTARRAY: {
      int i, j, n, cSep = '(';
      i = sqlite4_snprintf(zTemp, nTemp, "intarray");
      n = pOp->opcode==OP_Permutation ? pOp->p1 : 0;
      for(j=0; j<n; j++){
        i += sqlite4_snprintf(zTemp+i, nTemp-i,"%c%d",cSep, pOp->p4.ai[j]);
        cSep = ',';
      }
      sqlite4_snprintf(zTemp+i, nTemp-i, ")");
      break;
    }
    case P4_SUBPROGRAM: {
      sqlite4_snprintf(zTemp, nTemp, "program");
      break;
    }
    case P4_ADVANCE: {
      zTemp[0] = 0;
      break;
    }
    default: {
      if( pOp->opcode==OP_Blob ){
        int n = pOp->p1*2+2;
        if( n>nTemp-2 ) n = nTemp-2;
        zTemp[0] = 'x';
        zTemp[1] = '\'';
        sqlite4BlobToHex((n-2)/2,pOp->p4.z,zTemp+2);
        zTemp[n] = '\'';
        zTemp[n+1] = 0;
      }else{
        zP4 = pOp->p4.z;
        if( zP4==0 ){
          zP4 = zTemp;
          zTemp[0] = 0;
        }
      }
    }
  }
  assert( zP4!=0 );
  return zP4;
}
#endif