if (mParams.getEstimateSize() && mSizeEstimate == -1) mSizeEstimate = DbMailItem.countResults(conn, mConstraints, mbox);
    private void noLuceneGetNextChunk(Connection conn, Mailbox mbox, byte sort) throws ServiceException {        DbMailItem.search(mDBHits, conn, mConstraints, mbox, sort, mCurHitsOffset, mHitsPerChunk, mExtra);        if (mDBHits.size() < mHitsPerChunk) {            mEndOfHits = true;        }        // exponentially expand the chunk size in case we have to go back to the DB        mHitsPerChunk*=2;        if (mHitsPerChunk > MAX_HITS_PER_CHUNK) {            mHitsPerChunk = MAX_HITS_PER_CHUNK;        }    }