Enum solana_runtime::accounts_index::AccountsIndexScanResult

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pub enum AccountsIndexScanResult {
    None,
    KeepInMemory,
    Unref,
}

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None

if the entry is not in the in-memory index, do not add it, make no modifications to it

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KeepInMemory

keep the entry in the in-memory index

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Unref

reduce refcount by 1

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