Sumit,
I don't really understand the question - there are 3 calls to
mb:tsMatch in the examples. The random variable names
The normal execution strategy is to evaluate from beginning to end, and
so if
{
(?res ?12c9a9gnhunaw) mb:tsMatch ("me" ns0:creator) .
(?mi8huiqakycf ?1r4ut37ypo3yv) mb:tsMatch ("titre"@fr) .
?res ?1u4ua9v2zsqkt ?mi8huiqakycf .
(?res ?1r4ut37ypo3yv) mb:tsMatch ("titre"@fr) .
}
(?res ?12c9a9gnhunaw) mb:tsMatch ("me" ns0:creator) .
produces 2 results, then each is tried in the rest of the query.
(?mi8huiqakycf ?1r4ut?m3j8y01zhi1f37ypo3yv) mb:tsMatch ("titre"@fr) .
has no varaibles in common with the first part, but it will get called
twice.
{
(?remo9exejffl ?mpn8d16zc5oh) mb:tsMatch ("titre"@fr) .
?res ?m3j8y01zhi1f ?remo9exejffl .
(?res ?mpn8d16zc5oh) mb:tsMatch ("titre"@fr) .
(?res ?uoonek144gni) mb:tsMatch ("me" ns0:creator) .
}
the first two lines share ?remo9exejffl
There is no gauarentee that the same number of calls are made -
sometimes more calls, with more grouned arguments, will be made.
Andy
On 17/02/11 18:02, Sumit Raja wrote:
Hello,
It seems that differently ordered SPARQL queries is producing different
results and I need some clarification on why this may be happening. I have a
function that does a full text search (modelled exactly in the ARQ lucene
one except it uses Postgresql). For the purposes of this test I have mocked
the actual search out and am simply counting how many times the function is
executed.
In the first case I get an expected 2 calls to the function implementation
but in the second case I only get one and I was hoping someone could tell me
why (as this eventually will produce different results in an unmocked
situation). One thing to highlight is that the query does a search for
containers that may contain this string as well hence the additional query
elements. Not sure if I am not doing this container match correctly.
Case 1:
PREFIX ns0:<http://purl.org/dc/terms/>
PREFIX mb:<java:org.onionsoft.mediabag.jena.search.>
select ?res
where
{
(?res ?12c9a9gnhunaw) mb:tsMatch ("me" ns0:creator) .
(?mi8huiqakycf ?1r4ut37ypo3yv) mb:tsMatch ("titre"@fr) .<--------
Container Match
?res ?1u4ua9v2zsqkt ?mi8huiqakycf .<---------- Container Match
(?res ?1r4ut37ypo3yv) mb:tsMatch ("titre"@fr) .
}
BGP:
(sequence
(propfunc<java:org.onionsoft.mediabag.jena.search.tsMatch>
(?mi8huiqakycf ?1r4ut37ypo3yv) ("titre"@fr)
(propfunc<java:org.onionsoft.mediabag.jena.search.tsMatch>
(?res ?12c9a9gnhunaw) ("me"<http://purl.org/dc/terms/creator>)
(table unit)))
(bgp (triple ?res ?1u4ua9v2zsqkt ?mi8huiqakycf)))
Case 2:
PREFIX ns0:<http://purl.org/dc/terms/>
PREFIX mb:<java:org.onionsoft.mediabag.jena.search.>
select ?res
where
{
(?remo9exejffl ?mpn8d16zc5oh) mb:tsMatch ("titre"@fr) .
?res ?m3j8y01zhi1f ?remo9exejffl .
(?res ?mpn8d16zc5oh) mb:tsMatch ("titre"@fr) .
(?res ?uoonek144gni) mb:tsMatch ("me" ns0:creator) .
}
BGP:
(sequence
(propfunc<java:org.onionsoft.mediabag.jena.search.tsMatch>
(?remo9exejffl ?mpn8d16zc5oh) ("titre"@fr)
(table unit))
(bgp (triple ?res ?m3j8y01zhi1f ?remo9exejffl)))
Thanks
Sumit
