shibd opened a new pull request, #142:
URL: https://github.com/apache/pulsar-client-cpp/pull/142
Master Issue: apache/pulsar/pull/2685
### Motivation
Implementing AUTO_PUBLISH schema solves the following problems:
1. If a schema exists in a topic, but the producer does not know it. He
still wanted to send data to the topic. (The scenario in which the DLQ sends a
message: Please refer #139 **[Verifying this change][5]**)
2. For clients based on C++ implementations(Node and Python), these client
supports help users serialize and deserialize.
They can use this `AUTO_PUBLISH` schema feature to implement the same
semantics as Java clients.
### Modifications
- When creating a producer with `AUTO_PUBLISH` schema, try to get the schema
of that topic and use it.
- Support `getSchema` on `LookupService`(HTTP and Binary).
### Verifying this change
- Add `LookupServiceTest` unit test to cover `getSchema` logic.
- Add `SchemaTest.testAutoPublicSchema` unit test to cover creating
producer success when the topic has a schema.
### Documentation
- [ ] `doc-required`
(Your PR needs to update docs and you will update later)
- [x] `doc-not-needed`
(Please explain why)
- [ ] `doc`
(Your PR contains doc changes)
- [ ] `doc-complete`
(Docs have been already added)
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