Function storage_trie_wiped_changeset_iter 

pub fn storage_trie_wiped_changeset_iter(
    curr_values_of_changed: impl Iterator<Item = Result<(Nibbles, Option<BranchNodeCompact>), DatabaseError>>,
    all_nodes: impl Iterator<Item = Result<(Nibbles, BranchNodeCompact), DatabaseError>>,
) -> Result<impl Iterator<Item = Result<(Nibbles, Option<BranchNodeCompact>), DatabaseError>>, DatabaseError>

Returns an iterator which produces the values to be inserted into the StoragesTrieChangeSets table for an account whose storage was wiped during a block. It is expected that this is called prior to inserting the block’s trie updates.

Arguments

• curr_values_of_changed is an iterator over the current values of all trie nodes modified by the block, ordered by path.
• all_nodes is an iterator over all existing trie nodes for the account, ordered by path.

Returns

An iterator of trie node paths and a Some(node) (indicating the node was wiped) or a None (indicating the node was modified in the block but didn’t previously exist. The iterator’s results will be ordered by path.