1.3.9

• When parsing repeated pull attrs, last definition wins

1.3.8

• Add get to built-ins for binding on map values #423 thx @logseq-cldwalker

1.3.7

• Fixed :tupleAttrs in JS API #422

1.3.6

• Query comparison fns work for all data type and cross-types #420 #421 thx @zoren

1.3.5

Fixed pull on filtered dbs #419

1.3.4

• Fixed pull on deserialized DB

1.3.3

• Allow symbols as constants #416 #417 via @zoren

1.3.2

• Fixed multiple reverse refs bug #412

1.3.1

• Fixed reverse recursive pulls #411

1.3.0

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