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問題文

What does the mutate execution mode do, and why is it useful?

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1. It writes the result into the database but keeps it in a staging area until it is confirmed by a later call that makes it visible.
2. It returns the result rows and additionally logs them to the query log of the database for later inspection.
3. It writes the result into the projected graph, which lets several algorithms run on the same projection without going through the database in between.
4. It changes the projection itself by adding the node labels and relationship types that the algorithm needed but that were left out when the graph was first projected.