[core] Immutable table options can now be changed on an empty table #3845
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Purpose
Currently we have some immutable table options (for example, merge-engine and primary-key). Once the table is created, they cannot be changed.
However for an empty table, changing these options does not affect any data. Also ,we've supported different schemas for different branches in #3757. Users can set primary keys to a newly created branch with this feature.
Tests
API and Format
No API / format changes.
Documentation
No new feature.