private static String formatEpochMilli(long milli) {
    return TIMESTAMP_FORMAT.format(Instant.ofEpochMilli(milli));
  }
Generate next queryId using the following format: {@code yyyyMMdd_HHmmss_index_dataNodeId}

<p>{@code index} rolls at the start of every day or when it is close to reaching {@code
99,999}. {@code dataNodeId} is a unique id generated by config node when this data node is
created.
iotdb-core/datanode/src/main/java/org/apache/iotdb/db/queryengine/execution/QueryIdGenerator.java