Remove `EnterAt`, migrate `enterleave.rs`

TimelyDataflow / timely-dataflow

A modular implementation of timely dataflow in Rust

MIT License

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Remove `EnterAt`, migrate `enterleave.rs` #554

Closed frankmcsherry closed 8 months ago

frankmcsherry commented 8 months ago

This PR removes EnterAt which was recently seen to be an antipattern in differential dataflow (its delay operator queues data unnecessarily), and migrates the now-StreamCore-only enterleave.rs to the core dataflow module.