fix: memory leak in `Import` (backport #773)

cosmos / iavl

Merkleized IAVL+ Tree implementation in Go

Apache License 2.0

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Closed yihuang closed 1 year ago

yihuang commented 1 year ago

don't reference the children, which recursively retain the whole subtree in memory.

fedekunze commented 1 year ago

@tac0turtle @alexanderbez can you review this one too?