bug: root node get pruned when it's still referenced

[yihuang]

Wrote a unit test to reproduce.

thanks @mmsqe

the problem is here, we can't simply delete the old root node because it might be referenced by other versions down the road, but I guess we also can't leave it there, because it might create a gap in the versions, which violates the assumption in the design, right? @cool-develope

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[cool-develope]

Wrote a unit test to reproduce.

thanks @mmsqe

the problem is here, we can't simply delete the old root node because it might be referenced by other versions down the road, but I guess we also can't leave it there, because it might create a gap in the versions, which violates the assumption in the design, right? @cool-develope

thanks for this report, fixed in https://github.com/cosmos/iavl/pull/1007/files#diff-6df49839605c94e5caeb7d4549afe697ad97a00144ef26ec6746d9b5e8a3019cR162-R175

[yihuang]

Wrote a unit test to reproduce.
thanks @mmsqe
the problem is here, we can't simply delete the old root node because it might be referenced by other versions down the road, but I guess we also can't leave it there, because it might create a gap in the versions, which violates the assumption in the design, right? @cool-develope

thanks for this report, fixed in https://github.com/cosmos/iavl/pull/1007/files#diff-6df49839605c94e5caeb7d4549afe697ad97a00144ef26ec6746d9b5e8a3019cR162-R175

great, closing this one.