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In-memory flow slices representation

Currently, the flow slice contains some hardcoded structures and is then transformed into statistics and Values during each query processing. We'll change this so each flow slice contains:

  • Its own statistics (single snapshot).
  • An Rc of Headers (probably even within a refcell or something). The same headers will be shared by all the slices of the same flow (and, in the future, by a corresponding proto-slice).
  • Possibly some other auxiliary values.

It is possible to request a read-only borrow of each of these, and will be done through the ValueSrc, and the query processing modified to use this.

Each time slice will still be an array of these flow slices (don't forget to shring to fit it).

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information