Remove Tip isa Batch semantics #58
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This PR adjusts the stream encoding to facilitate being able to efficiently project using the CosmosDb changefeed based solely on the tracking of document insert operations.
This is a pessimization when compared to the scheme before, where the
TipisaBatchin some cases, but one we're taking for now.The queries presently explicitly exclude the
-1document; while this ups the RU cost a little, this is generally compensated for by the fact that unfolds will not travel unnecessary.It should also be noted that the present scheme also sets
itonconsistently, and leaveseas[]in the tip branch. This should facilitate treating the Tip as yet another Batch from the point of view of querying where relevant, and also allows us to slot in a projector that can deal with mutations of Tip at a later date.