JanZerebecki added a comment.

I understood "indexing everything" to mean that at least support answering a 
query for it with an exact value and traversing to things it is connected to 
without iterating over anything else. (Technically for Titan a composite index 
over one key, see 
http://s3.thinkaurelius.com/docs/titan/current/indexes.html#_composite_index .) 
I.e. support finding badges "Featured Article" and also support traversing to 
the site link one is connected to and then which item that is connected to. So 
this does not imply any fancy indices (like over functions) nor even full text, 
prefix or range indices.
Does it sound OK to have this as a baseline?

If there are no other indices that means e.g. that we can answer "Find people 
whose parents are married to each other." only by looking at every human that 
is married (which so far is indexed by exact value for each of the lookups on 
its own; i.e. no combined index for married humans) and then traversing to 
their children where both parents are in the previous set of humans (which is 
AFAIK currently not helped by any index).

A question about qualifiers: currently if there are two qualifiers with the 
same property on the same statement, it will be split when importing into Titan 
like as if it were two statements, is this something that is acceptable or 
should we correct this now?


TASK DETAIL
  https://phabricator.wikimedia.org/T86278

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To: Smalyshev, JanZerebecki
Cc: Aklapper, Smalyshev, Lydia_Pintscher, Multichill, Magnus, daniel, 
JeroenDeDauw, JanZerebecki, aude, mkroetzsch, Denny, Sjoerddebruin, 
Tobi_WMDE_SW, jkroll, Wikidata-bugs, GWicke, Manybubbles



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