Limit operator disappears in subqueries
antru6 opened this issue · comments
In some cases, the limit operator in inner subqueries miraculously disappears.
Example:
PREFIX ex: <http://example.org/>
SELECT * WHERE {
{
SELECT * WHERE {
ex:1 ex:p ?o .
}
ORDER BY ASC(?o)
LIMIT 1
}
?s ex:q ?o
}
The resulting plan is of the following form:
BindJoin
SourceQuery (source = http://endpoint_1/sparql)
Order
OrderElem (ASC)
Var (name=o)
StatementPattern
Var (name=_const_e443a916_uri, value=http://example.org/1, anonymous)
Var (name=_const_30c2a947_uri, value=http://example.org/p, anonymous)
Var (name=o)
SourceQuery (source = http://endpoint_2/sparql)
StatementPattern
Var (name=s)
Var (name=_const_2a49b376_uri, value=http://example.org/q, anonymous)
Var (name=o)