xhrg opened a new issue, #4710:
URL: https://github.com/apache/rocketmq/issues/4710
`
/**
* Query messages
*
* @param topic message topic
* @param key message key index word
* @param maxNum max message number
* @param begin from when
* @param end to when
* @return Instance of QueryResult
*/
QueryResult queryMessage(final String topic, final String **key**, final
int maxNum, final long begin,
final long end) throws MQClientException, InterruptedException;
`
When I test, the key cannot be "" or null，
If the key can be empty, it will be much more convenient to query the
message according to the time
我测试的时候，发现key不能为空或者null
如果key可以为空，根据时间查询消息会方便很多。
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