MariaDB Feature Deprecation Policy
It is unacceptable for a user to upgrade from a supported version A where a feature works normally to a version B where a feature doesn't exist without a warning.
Thus, when a feature is removed for some reason, the sequence of steps is as follows:
- the feature is marked as deprecated.
- we wait until all releases where the feature is not deprecated have reached EOL
- now the feature can be removed
With an LTS lifetime of 5 years, step 2 normally means that a feature cannot be removed until it's marked deprecated for 5 years. After that it can be removed or hidden behind a dedicated old-mode option, which will give it at least 5 more years until disappearance.
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