GWicke added a comment.
In https://phabricator.wikimedia.org/T85181#971763, @JanZerebecki wrote:
> No, just a list of things that were brought up, when people talked about
> querying Wikidata. I don't like Ask. Only ever used Ask and Cypher. I think
> the way Cypher goes about the problem is neat to work with (query by example
> for graphs). I find MQL a bit unintuitive.
Cypher looks pretty imperative, which IMHO is not ideal if we'd like to
independently optimize / rewrite queries.
> Is MQL a superset of wqd.wmflabs.org ?
Functionality-wise I believe that it covers pretty much everything wdq does,
except for the AROUND predicate. In MQL as exposed by freebase, the best you
can currently do is a bounding box with range queries on lat/lon. Adding an
AROUND-like operator should not be too hard though. The support around
optional: forbidden vs. != might be a bit more powerful in MQL.
> How would a recursive query (WITH RECURSIVE in SQL) / query including
> trasitive properties look like in MQL? Example: everything that is directly
> or indirectly/recursively subclass of organization.
I'm pretty sure that we'll want to flatten the common use cases for recursive
queries into indexes:
- instance of / type hierarchy ('type' in freebase)
- geolocation containment
With this done, you can directly ask for the parent class & automatically match
all items that are directly in a sub-class. Similarly, for geolocation you can
transitively match anything that's within some region, even if it is defined to
be within a sub-region.
MQL does support following edges, but encourages a limited depth of this
traversal by requiring the query to spell out the exact structure. It does not
allow queries with unspecified traversal depth.
TASK DETAIL
https://phabricator.wikimedia.org/T85181
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