void *pUserData
){
  Fts5PhraseIter iter;
  int iCol, iOff;
  u32 *aOut = (u32*)pUserData;
  int iPrev = -1;

  for(pApi->xPhraseFirst(pFts, 0, &iter, &iCol, &iOff); 
      iCol>=0; 
  for(pApi->xPhraseFirst(pFts, 0, &iter, &iCol, &iOff);
      iCol>=0;
      pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
  ){
    aOut[iCol*3+1]++;
    if( iCol!=iPrev ) aOut[iCol*3 + 2]++;
    iPrev = iCol;
  }

  return SQLITE_OK;
}

static int fts5MatchinfoGlobalCb(
  const Fts5ExtensionApi *pApi,
  Fts5Context *pFts,
  Fts5MatchinfoCtx *p,
  char f,
  u32 *aOut
){
  int rc = SQLITE_OK;
  switch( f ){
    case 'p':
      aOut[0] = p->nPhrase; 
      aOut[0] = p->nPhrase;
      break;

    case 'c':
      aOut[0] = p->nCol; 
      aOut[0] = p->nCol;
      break;

    case 'x': {
      int i;
      for(i=0; i<p->nPhrase && rc==SQLITE_OK; i++){
        void *pPtr = (void*)&aOut[i * p->nCol * 3];
        rc = pApi->xQueryPhrase(pFts, i, pPtr, fts5MatchinfoXCb);

      int nInt = ((p->nCol + 31) / 32) * p->nPhrase;
      for(i=0; i<nInt; i++) aOut[i] = 0;

      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iCol;
        for(pApi->xPhraseFirstColumn(pFts, iPhrase, &iter, &iCol);
            iCol>=0; 
            iCol>=0;
            pApi->xPhraseNextColumn(pFts, &iter, &iCol)
        ){
          aOut[iPhrase * ((p->nCol+31)/32) + iCol/32] |= ((u32)1 << iCol%32);
        }
      }

      break;
    }

    case 'x':
    case 'y': {
      int nMul = (f=='x' ? 3 : 1);
      int iPhrase;

      for(i=0; i<(p->nCol*p->nPhrase); i++) aOut[i*nMul] = 0;

      for(iPhrase=0; iPhrase<p->nPhrase; iPhrase++){
        Fts5PhraseIter iter;
        int iOff, iCol;
        for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff); 
            iOff>=0; 
        for(pApi->xPhraseFirst(pFts, iPhrase, &iter, &iCol, &iOff);
            iOff>=0;
            pApi->xPhraseNext(pFts, &iter, &iCol, &iOff)
        ){
          aOut[nMul * (iCol + iPhrase * p->nCol)]++;
        }
      }

      break;

      }

      break;
    }
  }
  return rc;
}
 

static Fts5MatchinfoCtx *fts5MatchinfoNew(
  const Fts5ExtensionApi *pApi,   /* API offered by current FTS version */
  Fts5Context *pFts,              /* First arg to pass to pApi functions */
  sqlite3_context *pCtx,          /* Context for returning error message */
  const char *zArg                /* Matchinfo flag string */
){
  Fts5MatchinfoCtx *p;