tree 6c819e7b8aa30ee3d7270290d3a0db08d5dd5ad6
parent 2ee34f38746f78b9e997ce882c1db7feeadacb8d
author wuYin <wuyinpost@gmail.com> 1609758764 +0800
committer GitHub <noreply@github.com> 1609758764 +0800
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deduplicate user topics before using them (#426)

### Motivation

- Deduplicate user topics before using them, just like client-java's `TreeSet` topics implementation, see [ConsumerConfigurationData.java#L56](https://github.com/apache/pulsar/blob/master/pulsar-client/src/main/java/org/apache/pulsar/client/impl/conf/ConsumerConfigurationData.java#L56)


### Modifications

- add `distinct` utility function to deduplicate user provided topics