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Helps (or arguably fixes) #468 For smarter batch constitution (following up on #448), it is required to have access to the token a particular statement would be directed to. However, that is pretty difficult to do without access to calculate_token. That was initially put in #508, but planned to put in a separate pr to keep it minimal (#508 (comment)) It seems I had forgotten to open that separate PR, and I end up getting bitten by that now that I want to constitute my batches in a smarter way. So here it is. I'm only putting "helps" above because I think we may want to also expose query planning ( `session.plan(prepared_statement, serialized_values) -> impl Iterator<Item = (Arc<Node>, ShardID)>` ) as that may make it significantly easier - but I'd like to keep this PR that just *enables* the ideal behavior as simple as possible.
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