Various bugfixes. Ensured node ids in the triple graph use 64 bits.

[floriankramer]

The main problem fixed was the vectors storing the SubtreePlans of a
graphs children in the QueryPlanner being resized and thus reallocating
while pointers to the previous location of these plans were still in
use. This fixes the following query:

PREFIX wikibase: <http://wikiba.se/ontology#>
PREFIX rdfs: <http://www.w3.org/2000/01/rdf-schema#>
PREFIX wd: <http://www.wikidata.org/entity/>
PREFIX p: <http://www.wikidata.org/prop/>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX skos: <http://www.w3.org/2004/02/skos/core#>
PREFIX wdt: <http://www.wikidata.org/prop/direct/>
PREFIX psv: <http://www.wikidata.org/prop/statement/value/>

SELECT ?QLC_COMPLETE ?QLC_COUNT ?QLC_ALIAS_COMPLETE WHERE {
 {
  SELECT ?QLC_COMPLETE (COUNT(?QLC_COMPLETE) AS ?QLC_COUNT) WHERE {
   ?occupation_id ql:has-predicate ?QLC_COMPLETE .
   ?x wdt:P106 ?occupation_id .
   ?x wdt:P31 wd:Q5 .
   ?x p:P2048 ?statement .
   ?x wdt:P21 ?gender_id .
   ?gender_id @en@<http://www.w3.org/2000/01/rdf-schema#label> ?gender .
   ?statement psv:P2048 ?value .
   ?value wikibase:quantityNormalized ?quantity .
   ?quantity wikibase:quantityUnit wd:Q11573 .
   ?quantity wikibase:quantityAmount ?height .
  }
  GROUP BY ?QLC_COMPLETE
 }
 {
  {
   ?QLC_CLAIM wikibase:directClaim ?QLC_COMPLETE .
  } UNION {
   ?QLC_CLAIM wikibase:claim ?QLC_COMPLETE .
  }
 } UNION {
  ?QLC_CLAIM wikibase:statementValue ?QLC_COMPLETE .
 }

 { ?QLC_CLAIM @en@rdfs:label ?QLC_ALIAS_COMPLETE . } UNION { ?QLC_CLAIM @en@skos:altLabel ?QLC_ALIAS_COMPLETE .}
}
ORDER BY DESC(?QLC_COUNT) 

[niklas88]

Looks great, must have been quite an investigation to find that overflow! I'm impressed.