ClickHouse/.github/ISSUE_TEMPLATE/80_backward-compatibility.md

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---
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name: Backward compatibility issue
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about: Report the case when the behaviour of a new version can break existing use cases
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title: ''
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labels: backward compatibility
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assignees: ''
---
(you don't have to strictly follow this form)
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**Company or project name**
Put your company name or project description here
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**Describe the issue**
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A clear and concise description of what works not as it is supposed to.
**How to reproduce**
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* Which ClickHouse server versions are incompatible
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* Which interface to use, if matters
* Non-default settings, if any
* `CREATE TABLE` statements for all tables involved
* Sample data for all these tables, use [clickhouse-obfuscator](https://github.com/ClickHouse/ClickHouse/blob/master/programs/obfuscator/Obfuscator.cpp#L42-L80) if necessary
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* Queries to run that lead to unexpected result
**Error message and/or stacktrace**
If applicable, add screenshots to help explain your problem.
**Additional context**
Add any other context about the problem here.