docs: public List<Long> selectPostIds() throws SQLException {
        List<Long> ids = Lists.newArrayListWithExpectedSize(4096);
        Connection conn = null;
        Statement stmt = null;
        ResultSet rs = null;
  
        try {
           conn = connectionSupplier.getConnection();
           stmt = conn.createStatement();
           rs = stmt.executeQuery(selectAllPostIdsSQL);
           while(rs.next()) {
              ids.add(rs.getLong(1));
           }
        } finally {
           SQLUtil.closeQuietly(conn, stmt, rs);
        }
        return ids;
     }