Hi,
If I'm executing a query in sparql, in Virtuoso 7, that uses heavy graph
filtering along the lines of:
SELECT *
{ GRAPH ?G {
filter ( ?G in (<test1>, <test2>....<test76>) )
....
}}
Will this cause large temporary tables to be created or will it just do
lookups against the Graph column of the Quad store?
If the above is a bad idea, is there a more efficient way to join or filter
graphs?
A secondary question is would this query be rendered much more expensive if
it included a subclause along the lines of:
SELECT *
{ GRAPH ?G {
filter ( ?G in (<test1>, <test2>....<test76>) )
{ GRAPH ?Ginner {
filter (?Ginner in ( <test11>,<test13>,<test17> ) )
}}}}
Does this type of construction force temporary tables?
--
Quentin | Clear Blue Water Pty Ltd
quent...@clearbluewater.com.au
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