[GitHub] zhaijack opened a new pull request #1165: PIP-13-2: support regex based subscription

[GitBox <gi...@apache.org>]

zhaijack opened a new pull request #1165: PIP-13-2: support regex based subscription
URL: https://github.com/apache/incubator-pulsar/pull/1165
 
 
   This change is based on work of #1103, which already contains the first 3 commits there. In this PR, the commits after the first 3 are for this sub-task. 
   
   ### Motivation
   This is a second sub-task for pip-13, which would like to leverage the first task to support regex based subscription.
   
   ### Modifications
   - add subscribe methods with regex pattern in `PulsarClient` and `PulsarClientImpl`.
   - add `PatternTopicsConsumerImpl`, which extends `TopicsConsumerImpl`.
   - add a binary proto command to get topics under a namespace. 
   - add a test to verify.
   
   ### Result
   old methods behaviour not changed, 
   user could use new method to subscribe to topics based on regex pattern

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