https://github.com/tonsky/datascript/releases/tag/1.3.0

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 1. Releases
 2. 1.3.0

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1.3.0

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@tonsky tonsky released this
1.3.0
feb04f5
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New pull implementation

Pull has been a great API for a long time in Datomic and DataScript,
with only one gotcha: it wasn't performant. Up to the point where
building pull tree manually using entities would outperform pull,
even with all entities overhead. This seemed weird, because pull has
much more information ahead of time, which could be leveraged for
optimizations.

Well, you don't have to compromise performance for convenience
anymore. DataScript 1.3.0 features much faster pull implementation:

  * Up to 7 times faster than old impl
  * Up to 2,5 times faster than doing pull through entities
  * Up to 4 times faster than Datomic in-memory

Numbers depend on particular database/pattern, so don't trust them
too much!

Also in new impl:

  * Support :xform
  * Cached parse results
  * Fixed wildcard + recursion bug: [* {:child ...}] did not work
    before
  * A callback to track all entities touched by pull (usable for
    reactive dependency tracking)

Also in 1.3.0

  * Simplified benchmark code
  * Ability to override query parse cache: datascript.query/
    *query-cache*

Benchmark

Some raw numbers from built-in benchmark (ms per operation, lower is
better).

Clojure:

  Benchmark   Entities Old pull New pull
pull-one      0.6      2.5      0.5
pull-many     1.9      5.4      0.8
pull-wildcard n/a      n/a      1.1

ClojureScript:

  Benchmark   Entities Old pull New pull
pull-one      1.7      7.3      1.3
pull-many     5.2      15.1     2.2
pull-wildcard n/a      n/a      2.8

Datomic in-memory:

  Benchmark   Entities Pull
pull-one      0.7      0.8
pull-many     2.3      2.5
pull-wildcard n/a      4.7

Assets

3

  * datascript-1.3.0.min.js 443 KB
  * Source code (zip)
  * Source code (tar.gz)

13 people reacted
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