New implementation parallel joins #84
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Current coverage is 76.03% (diff: 87.71%)@@ master #84 diff @@
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I'll rebase this on the current master. |
This adds the `Join` construct to the underlying Fetch structure. The `Join`s are paralellized in a new interpreter `parallelJoinPhase`. The new parallel optimization fiddles with the `Free` structure to look for independent queries and to simplify queries if the results are cached. Everything in a `fetch.map(...)` or `fetch.flatMap(...)` should be only executed once (currently this isn't yet the case for pure fetches created with `Fetch.pure`).
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LGTM |
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This changes the way fetches are inspected to parallelize independent fetches. It does this by adding a new
Joinconstruct to theFetchstructure. ThisJoinis parallelized in a new intermediate interpreter which inspects the actualFreeconstructs and replaces cached fetches byFree.Pure.It does play a bit fast and loose with the laws with this fiddling with
Freeunder the hood, but it now executes code in afetch.map(...)or afetch.flatMap(...)only once.(The other PR updating cats and adding Scala 2.12 support should be merged first).