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Posted to java-user@lucene.apache.org by Ramana Jelda <ra...@ciao-group.com> on 2007/03/02 11:45:02 UTC
How can I use SortComparator in my case?
Hi,
I have a requirement to sort search results in a round robin.
Ex:sorting results by field "customer"
suppose following customers are found (number of results in brackets) and
results are sorted by customer.
Amazon(10)
Dell(2)
EBay(4)
Yahoo(20)
but I want to sort them in the following way,
Amazon(1)
Dell(1)
EBay(1)
Yahoo(1)
Amazon(1)
Dell(1)
EBay(1)
Yahoo(1)
Amazon(1)
EBay(1)
Yahoo(1)
Amazon(1)
EBay(1)
Yahoo(1)
etc.. etc..
You think I can use somehow SortComparator here?
any suggestions?
Thx,
Jelda
RE: How can I use SortComparator in my case?
Posted by Ramana Jelda <ra...@ciao-group.com>.
Actually I don't like well my proposed way of implementation.
I wanna play with score to implement the similar logic as I mentioned in my
solution.
But how?
Any suggestions, I would really appreciate. :)
Jelda
> -----Original Message-----
> From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> Sent: Tuesday, March 27, 2007 11:59 AM
> To: java-user@lucene.apache.org
> Subject: RE: How can I use SortComparator in my case?
>
> Thanks for all your help.
> Here I am coming with the best solution I can see and I am
> planning to implement this.
>
> Suppose 20 unique customers && 90,000 results found && to be
> returned offset results 0-20
>
> I can think of only following solution..
> //Hope pseudo code is self understandable..
>
> Public MyCollector extends TopFieldDocCollector{ private
> Hashtable<String, FieldSortedHitQueue> hitQueues = new
> Hashtable<String, FieldSortedHitQueue>();
>
> public void collect(int docId, float score) {
> super.collect(doc, score);
> String c =
> cachedCustomerKeywordTerms.getGroupTerm("customer",
> docId); //like FielCache etc.
> FieldSortedHitQueue hitQueue = hitQueues.get(c);
> if(hitQueue == null){
> hitQueue = new FieldSortedHitQueue(reader,
> sort, numHits);
> hitQueues.put(c, hitQueue);
> }
> hitQueue.insert(new FieldDoc(docId, score));
>
> }
>
> /**
> Topdocs implementation overridden.
> Probably needs some improvements in sorting customers by score..
> */
>
> public TopDocs topDocs() {
> //just preparing Vector to be able to sort easily
> Vector<FieldSortedHitQueue> actualHitQueues = new
> Vector<FieldSortedHitQueue>();
> Enumeration<FieldSortedHitQueue> e = hitQueues.elements();
> while(e.hasMoreElements()){
> FieldSortedHitQueue fq = e.nextElement();
> actualHitQueues.addElement(fq);
> }
>
> //sort Vector by maxScore..
> Collections.sort(actualHitQueues, new
> Comparator<FieldSortedHitQueue>() {
> public int compare(FieldSortedHitQueue
> o1, FieldSortedHitQueue o2) {
> return
> Float.compare(o1.getMaxScore(), o2.getMaxScore());
> }
> });
>
> TopDocs topDocs = super.topDocs();
>
> int i=0;
> while(i < topDocs.scoreDocs.length){
> for(int j = 0; j < actualHitQueues.size(); j++){
> FieldSortedHitQueue fq = actualHitQueues.get(j);
> FieldDoc fd = (FieldDoc) fq.pop();
> if(fd != null){
> topDocs.scoreDocs[i] = fd;
> i =i+1;
> if(i==topDocs.scoreDocs.length) break;
> }
> }
> }
>
> return topDocs;
> }
> }
>
>
> I would really appreciate your suggestions or improvements .
>
> Thx in advance,
> Jelda
>
>
> > -----Original Message-----
> > From: Doron Cohen [mailto:DORONC@il.ibm.com]
> > Sent: Monday, March 05, 2007 10:22 PM
> > To: java-user@lucene.apache.org
> > Subject: Re: How can I use SortComparator in my case?
> >
> > I too cannot think of an indexing configuration that would
> help this.
> >
> > However it seems that all the required information exists at search
> > time, more precisely at hits collection time:
> > - the doc-id and doc-score are known, and used when hits are
> > collected.
> > - The value of that certain field of interested can be computed -
> > similar to how it is computed for sorting by a field - but
> its use is
> > different - sorting should not be by the value of the field, but
> > rather by how many docs with the same value for this field were
> > "collected" so far.
> >
> > This seems to call for a tailored hit collector. The search
> API allows
> > for providing a customized hit collector, where this counting logic
> > could be added. (The challenge is in avoiding calling
> > reader.document(id,fieldSelector) in collect() because this
> would be
> > quite bad for performance in a large collection - see javadocs for
> > HitCollector.collect() - but it must be a large collection,
> otherwise,
> > for a small collection, the post process approach proposed
> here would
> > do.)
> >
> > Doron
> >
> > "Erick Erickson" <er...@gmail.com> wrote on
> > 05/03/2007 04:48:10:
> >
> > > There's a discussion recently where someone pointed me to
> > > FieldSortedHitQueue, you might trysearchinng for that. Also, try
> > > "buckets" which was the header of that discussion.
> > >
> > > You can also think about clever indexing schemes with fields that
> > > allow you to sort however you really need to, although I confess
> > > nothing jumps out at me given your example.
> > >
> > > Best
> > > Erick
> > >
> > >
> > > On 3/5/07, Ramana Jelda <ra...@ciao-group.com> wrote:
> > > >
> > > > This will then be a big hastle. The results are in 100s and
> > > > sometimes
> > in
> > > > 1000s.
> > > > Hum.. No other better way?
> > > >
> > > > Jelda
> > > >
> > > > > -----Original Message-----
> > > > > From: Mordo, Aviran (EXP N-NANNATEK)
> > > > > [mailto:aviran.mordo@lmco.com]
> > > > > Sent: Friday, March 02, 2007 8:02 PM
> > > > > To: java-user@lucene.apache.org
> > > > > Subject: RE: How can I use SortComparator in my case?
> > > > >
> > > > > You'll need to do it manually and not with Lucene.
> > > > >
> > > > > Just grab all the results from Lucene and process
> them yourself.
> > > > >
> > > > > Aviran
> > > > > http://aviransplace.com
> > > > >
> > > > > -----Original Message-----
> > > > > From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> > > > > Sent: Friday, March 02, 2007 5:45 AM
> > > > > To: java-user@lucene.apache.org
> > > > > Subject: How can I use SortComparator in my case?
> > > > >
> > > > > Hi,
> > > > > I have a requirement to sort search results in a round robin.
> > > > > Ex:sorting results by field "customer"
> > > > > suppose following customers are found (number of results in
> > > > > brackets) and results are sorted by customer.
> > > > >
> > > > > Amazon(10)
> > > > > Dell(2)
> > > > > EBay(4)
> > > > > Yahoo(20)
> > > > >
> > > > > but I want to sort them in the following way,
> > > > > Amazon(1)
> > > > > Dell(1)
> > > > > EBay(1)
> > > > > Yahoo(1)
> > > > >
> > > > > Amazon(1)
> > > > > Dell(1)
> > > > > EBay(1)
> > > > > Yahoo(1)
> > > > >
> > > > > Amazon(1)
> > > > > EBay(1)
> > > > > Yahoo(1)
> > > > >
> > > > > Amazon(1)
> > > > > EBay(1)
> > > > > Yahoo(1)
> > > > >
> > > > > etc.. etc..
> > > > >
> > > > >
> > > > > You think I can use somehow SortComparator here?
> > > > > any suggestions?
> > > > >
> > > > > Thx,
> > > > > Jelda
> > > > >
> > > > >
> > > > >
> > ------------------------------------------------------------------
> > > > > --- To unsubscribe, e-mail:
> > > > > java-user-unsubscribe@lucene.apache.org
> > > > > For additional commands, e-mail:
> > java-user-help@lucene.apache.org
> > > > >
> > > >
> > > >
> > > >
> > --------------------------------------------------------------------
> > > > - To unsubscribe, e-mail:
> java-user-unsubscribe@lucene.apache.org
> > > > For additional commands, e-mail:
> java-user-help@lucene.apache.org
> > > >
> > > >
> >
> >
> >
> ---------------------------------------------------------------------
> > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
---------------------------------------------------------------------
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RE: How can I use SortComparator in my case?
Posted by Ramana Jelda <ra...@ciao-group.com>.
Thanks for all your help.
Here I am coming with the best solution I can see and I am planning to
implement this.
Suppose 20 unique customers && 90,000 results found && to be returned offset
results 0-20
I can think of only following solution..
//Hope pseudo code is self understandable..
Public MyCollector extends TopFieldDocCollector{
private Hashtable<String, FieldSortedHitQueue> hitQueues = new
Hashtable<String, FieldSortedHitQueue>();
public void collect(int docId, float score) {
super.collect(doc, score);
String c = cachedCustomerKeywordTerms.getGroupTerm("customer",
docId); //like FielCache etc.
FieldSortedHitQueue hitQueue = hitQueues.get(c);
if(hitQueue == null){
hitQueue = new FieldSortedHitQueue(reader, sort, numHits);
hitQueues.put(c, hitQueue);
}
hitQueue.insert(new FieldDoc(docId, score));
}
/**
Topdocs implementation overridden.
Probably needs some improvements in sorting customers by score..
*/
public TopDocs topDocs() {
//just preparing Vector to be able to sort easily
Vector<FieldSortedHitQueue> actualHitQueues = new
Vector<FieldSortedHitQueue>();
Enumeration<FieldSortedHitQueue> e = hitQueues.elements();
while(e.hasMoreElements()){
FieldSortedHitQueue fq = e.nextElement();
actualHitQueues.addElement(fq);
}
//sort Vector by maxScore..
Collections.sort(actualHitQueues, new
Comparator<FieldSortedHitQueue>() {
public int compare(FieldSortedHitQueue o1,
FieldSortedHitQueue o2) {
return Float.compare(o1.getMaxScore(),
o2.getMaxScore());
}
});
TopDocs topDocs = super.topDocs();
int i=0;
while(i < topDocs.scoreDocs.length){
for(int j = 0; j < actualHitQueues.size(); j++){
FieldSortedHitQueue fq = actualHitQueues.get(j);
FieldDoc fd = (FieldDoc) fq.pop();
if(fd != null){
topDocs.scoreDocs[i] = fd;
i =i+1;
if(i==topDocs.scoreDocs.length) break;
}
}
}
return topDocs;
}
}
I would really appreciate your suggestions or improvements .
Thx in advance,
Jelda
> -----Original Message-----
> From: Doron Cohen [mailto:DORONC@il.ibm.com]
> Sent: Monday, March 05, 2007 10:22 PM
> To: java-user@lucene.apache.org
> Subject: Re: How can I use SortComparator in my case?
>
> I too cannot think of an indexing configuration that would help this.
>
> However it seems that all the required information exists at
> search time, more precisely at hits collection time:
> - the doc-id and doc-score are known, and used when hits are
> collected.
> - The value of that certain field of interested can be
> computed - similar to how it is computed for sorting by a
> field - but its use is different - sorting should not be by
> the value of the field, but rather by how many docs with the
> same value for this field were "collected" so far.
>
> This seems to call for a tailored hit collector. The search
> API allows for providing a customized hit collector, where
> this counting logic could be added. (The challenge is in
> avoiding calling
> reader.document(id,fieldSelector) in collect() because this
> would be quite bad for performance in a large collection -
> see javadocs for
> HitCollector.collect() - but it must be a large collection,
> otherwise, for a small collection, the post process approach
> proposed here would do.)
>
> Doron
>
> "Erick Erickson" <er...@gmail.com> wrote on
> 05/03/2007 04:48:10:
>
> > There's a discussion recently where someone pointed me to
> > FieldSortedHitQueue, you might trysearchinng for that. Also, try
> > "buckets" which was the header of that discussion.
> >
> > You can also think about clever indexing schemes with fields that
> > allow you to sort however you really need to, although I confess
> > nothing jumps out at me given your example.
> >
> > Best
> > Erick
> >
> >
> > On 3/5/07, Ramana Jelda <ra...@ciao-group.com> wrote:
> > >
> > > This will then be a big hastle. The results are in 100s and
> > > sometimes
> in
> > > 1000s.
> > > Hum.. No other better way?
> > >
> > > Jelda
> > >
> > > > -----Original Message-----
> > > > From: Mordo, Aviran (EXP N-NANNATEK)
> > > > [mailto:aviran.mordo@lmco.com]
> > > > Sent: Friday, March 02, 2007 8:02 PM
> > > > To: java-user@lucene.apache.org
> > > > Subject: RE: How can I use SortComparator in my case?
> > > >
> > > > You'll need to do it manually and not with Lucene.
> > > >
> > > > Just grab all the results from Lucene and process them yourself.
> > > >
> > > > Aviran
> > > > http://aviransplace.com
> > > >
> > > > -----Original Message-----
> > > > From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> > > > Sent: Friday, March 02, 2007 5:45 AM
> > > > To: java-user@lucene.apache.org
> > > > Subject: How can I use SortComparator in my case?
> > > >
> > > > Hi,
> > > > I have a requirement to sort search results in a round robin.
> > > > Ex:sorting results by field "customer"
> > > > suppose following customers are found (number of results in
> > > > brackets) and results are sorted by customer.
> > > >
> > > > Amazon(10)
> > > > Dell(2)
> > > > EBay(4)
> > > > Yahoo(20)
> > > >
> > > > but I want to sort them in the following way,
> > > > Amazon(1)
> > > > Dell(1)
> > > > EBay(1)
> > > > Yahoo(1)
> > > >
> > > > Amazon(1)
> > > > Dell(1)
> > > > EBay(1)
> > > > Yahoo(1)
> > > >
> > > > Amazon(1)
> > > > EBay(1)
> > > > Yahoo(1)
> > > >
> > > > Amazon(1)
> > > > EBay(1)
> > > > Yahoo(1)
> > > >
> > > > etc.. etc..
> > > >
> > > >
> > > > You think I can use somehow SortComparator here?
> > > > any suggestions?
> > > >
> > > > Thx,
> > > > Jelda
> > > >
> > > >
> > > >
> ------------------------------------------------------------------
> > > > --- To unsubscribe, e-mail:
> > > > java-user-unsubscribe@lucene.apache.org
> > > > For additional commands, e-mail:
> java-user-help@lucene.apache.org
> > > >
> > >
> > >
> > >
> --------------------------------------------------------------------
> > > - To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > >
> > >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
---------------------------------------------------------------------
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For additional commands, e-mail: java-user-help@lucene.apache.org
Re: How can I use SortComparator in my case?
Posted by Doron Cohen <DO...@il.ibm.com>.
I too cannot think of an indexing configuration that would help this.
However it seems that all the required information exists at search time,
more precisely at hits collection time:
- the doc-id and doc-score are known, and used when hits are collected.
- The value of that certain field of interested can be computed - similar
to how it is computed for sorting by a field - but its use is different -
sorting should not be by the value of the field, but rather by how many
docs with the same value for this field were "collected" so far.
This seems to call for a tailored hit collector. The search API allows for
providing a customized hit collector, where this counting logic could be
added. (The challenge is in avoiding calling
reader.document(id,fieldSelector) in collect() because this would be quite
bad for performance in a large collection - see javadocs for
HitCollector.collect() - but it must be a large collection, otherwise, for
a small collection, the post process approach proposed here would do.)
Doron
"Erick Erickson" <er...@gmail.com> wrote on 05/03/2007 04:48:10:
> There's a discussion recently where someone pointed me to
> FieldSortedHitQueue, you might trysearchinng for that. Also, try
> "buckets" which was the header of that discussion.
>
> You can also think about clever indexing schemes with fields that
> allow you to sort however you really need to, although I confess
> nothing jumps out at me given your example.
>
> Best
> Erick
>
>
> On 3/5/07, Ramana Jelda <ra...@ciao-group.com> wrote:
> >
> > This will then be a big hastle. The results are in 100s and sometimes
in
> > 1000s.
> > Hum.. No other better way?
> >
> > Jelda
> >
> > > -----Original Message-----
> > > From: Mordo, Aviran (EXP N-NANNATEK) [mailto:aviran.mordo@lmco.com]
> > > Sent: Friday, March 02, 2007 8:02 PM
> > > To: java-user@lucene.apache.org
> > > Subject: RE: How can I use SortComparator in my case?
> > >
> > > You'll need to do it manually and not with Lucene.
> > >
> > > Just grab all the results from Lucene and process them yourself.
> > >
> > > Aviran
> > > http://aviransplace.com
> > >
> > > -----Original Message-----
> > > From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> > > Sent: Friday, March 02, 2007 5:45 AM
> > > To: java-user@lucene.apache.org
> > > Subject: How can I use SortComparator in my case?
> > >
> > > Hi,
> > > I have a requirement to sort search results in a round robin.
> > > Ex:sorting results by field "customer"
> > > suppose following customers are found (number of results in
> > > brackets) and results are sorted by customer.
> > >
> > > Amazon(10)
> > > Dell(2)
> > > EBay(4)
> > > Yahoo(20)
> > >
> > > but I want to sort them in the following way,
> > > Amazon(1)
> > > Dell(1)
> > > EBay(1)
> > > Yahoo(1)
> > >
> > > Amazon(1)
> > > Dell(1)
> > > EBay(1)
> > > Yahoo(1)
> > >
> > > Amazon(1)
> > > EBay(1)
> > > Yahoo(1)
> > >
> > > Amazon(1)
> > > EBay(1)
> > > Yahoo(1)
> > >
> > > etc.. etc..
> > >
> > >
> > > You think I can use somehow SortComparator here?
> > > any suggestions?
> > >
> > > Thx,
> > > Jelda
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > > For additional commands, e-mail: java-user-help@lucene.apache.org
> > >
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
> >
---------------------------------------------------------------------
To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
For additional commands, e-mail: java-user-help@lucene.apache.org
Re: How can I use SortComparator in my case?
Posted by Erick Erickson <er...@gmail.com>.
There's a discussion recently where someone pointed me to
FieldSortedHitQueue, you might trysearchinng for that. Also, try
"buckets" which was the header of that discussion.
You can also think about clever indexing schemes with fields that
allow you to sort however you really need to, although I confess
nothing jumps out at me given your example.
Best
Erick
On 3/5/07, Ramana Jelda <ra...@ciao-group.com> wrote:
>
> This will then be a big hastle. The results are in 100s and sometimes in
> 1000s.
> Hum.. No other better way?
>
> Jelda
>
> > -----Original Message-----
> > From: Mordo, Aviran (EXP N-NANNATEK) [mailto:aviran.mordo@lmco.com]
> > Sent: Friday, March 02, 2007 8:02 PM
> > To: java-user@lucene.apache.org
> > Subject: RE: How can I use SortComparator in my case?
> >
> > You'll need to do it manually and not with Lucene.
> >
> > Just grab all the results from Lucene and process them yourself.
> >
> > Aviran
> > http://aviransplace.com
> >
> > -----Original Message-----
> > From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> > Sent: Friday, March 02, 2007 5:45 AM
> > To: java-user@lucene.apache.org
> > Subject: How can I use SortComparator in my case?
> >
> > Hi,
> > I have a requirement to sort search results in a round robin.
> > Ex:sorting results by field "customer"
> > suppose following customers are found (number of results in
> > brackets) and results are sorted by customer.
> >
> > Amazon(10)
> > Dell(2)
> > EBay(4)
> > Yahoo(20)
> >
> > but I want to sort them in the following way,
> > Amazon(1)
> > Dell(1)
> > EBay(1)
> > Yahoo(1)
> >
> > Amazon(1)
> > Dell(1)
> > EBay(1)
> > Yahoo(1)
> >
> > Amazon(1)
> > EBay(1)
> > Yahoo(1)
> >
> > Amazon(1)
> > EBay(1)
> > Yahoo(1)
> >
> > etc.. etc..
> >
> >
> > You think I can use somehow SortComparator here?
> > any suggestions?
> >
> > Thx,
> > Jelda
> >
> >
> > ---------------------------------------------------------------------
> > To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> > For additional commands, e-mail: java-user-help@lucene.apache.org
> >
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: java-user-unsubscribe@lucene.apache.org
> For additional commands, e-mail: java-user-help@lucene.apache.org
>
>
RE: How can I use SortComparator in my case?
Posted by Ramana Jelda <ra...@ciao-group.com>.
This will then be a big hastle. The results are in 100s and sometimes in
1000s.
Hum.. No other better way?
Jelda
> -----Original Message-----
> From: Mordo, Aviran (EXP N-NANNATEK) [mailto:aviran.mordo@lmco.com]
> Sent: Friday, March 02, 2007 8:02 PM
> To: java-user@lucene.apache.org
> Subject: RE: How can I use SortComparator in my case?
>
> You'll need to do it manually and not with Lucene.
>
> Just grab all the results from Lucene and process them yourself.
>
> Aviran
> http://aviransplace.com
>
> -----Original Message-----
> From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
> Sent: Friday, March 02, 2007 5:45 AM
> To: java-user@lucene.apache.org
> Subject: How can I use SortComparator in my case?
>
> Hi,
> I have a requirement to sort search results in a round robin.
> Ex:sorting results by field "customer"
> suppose following customers are found (number of results in
> brackets) and results are sorted by customer.
>
> Amazon(10)
> Dell(2)
> EBay(4)
> Yahoo(20)
>
> but I want to sort them in the following way,
> Amazon(1)
> Dell(1)
> EBay(1)
> Yahoo(1)
>
> Amazon(1)
> Dell(1)
> EBay(1)
> Yahoo(1)
>
> Amazon(1)
> EBay(1)
> Yahoo(1)
>
> Amazon(1)
> EBay(1)
> Yahoo(1)
>
> etc.. etc..
>
>
> You think I can use somehow SortComparator here?
> any suggestions?
>
> Thx,
> Jelda
>
>
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RE: How can I use SortComparator in my case?
Posted by "Mordo, Aviran (EXP N-NANNATEK)" <av...@lmco.com>.
You'll need to do it manually and not with Lucene.
Just grab all the results from Lucene and process them yourself.
Aviran
http://aviransplace.com
-----Original Message-----
From: Ramana Jelda [mailto:ramana.jelda@ciao-group.com]
Sent: Friday, March 02, 2007 5:45 AM
To: java-user@lucene.apache.org
Subject: How can I use SortComparator in my case?
Hi,
I have a requirement to sort search results in a round robin.
Ex:sorting results by field "customer"
suppose following customers are found (number of results in brackets)
and results are sorted by customer.
Amazon(10)
Dell(2)
EBay(4)
Yahoo(20)
but I want to sort them in the following way,
Amazon(1)
Dell(1)
EBay(1)
Yahoo(1)
Amazon(1)
Dell(1)
EBay(1)
Yahoo(1)
Amazon(1)
EBay(1)
Yahoo(1)
Amazon(1)
EBay(1)
Yahoo(1)
etc.. etc..
You think I can use somehow SortComparator here?
any suggestions?
Thx,
Jelda
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