[Xapian-tickets] [Xapian] #256: Bug when i switch from a sorting mode to an other in python

[Xapian]

#256: Bug when i switch from a sorting mode to an other in python
----------------------------+---------------------------
 Reporter:  versmisse       |             Owner:  olly
     Type:  defect          |            Status:  closed
 Priority:  normal          |         Milestone:  1.0.7
Component:  Library API     |           Version:  1.0.6
 Severity:  normal          |        Resolution:  fixed
 Keywords:  Enquire python  |        Blocked By:
 Blocking:                  |  Operating System:  All
----------------------------+---------------------------
Description changed by mariakatosvich:

Old description:

> Hello,
>
> I'm a French developer and i really want to use xapian for a project. We
> already have a "catalog" object but it is not efficient enough.
>
> I have already written a good part of the code (in python), but i have a
> problem with Enquire. When i use two different sorters and the first one
> no longer exists (simulated by a "del" in the snippet), i have an error.
>
> I simulate my problem with the following snippet that crashes with a
> beautiful segmentation fault
> {{{
> #!/usr/bin/python
> # -*- coding: UTF-8 -*-
>
> from xapian import (WritableDatabase, DB_CREATE_OR_OPEN, Document,
>                     Query, Enquire, MultiValueSorter,
>                     sortable_serialise)
>
> db = WritableDatabase('my_db', DB_CREATE_OR_OPEN)
>
> doc1 = Document()
> doc1.add_posting('foo', 0)
> doc1.add_value(0, sortable_serialise(1))
> doc1.add_value(1, 'doc1')
>
> doc2 = Document()
> doc2.add_posting('foo', 0)
> doc2.add_value(0, sortable_serialise(2))
> doc2.add_value(1, 'doc2')
>
> db.add_document(doc1)
> db.add_document(doc2)
>
> enquire = Enquire(db)
> enquire.set_query(Query(''))
>

> sorter = MultiValueSorter()
> sorter.add(0)
> enquire.set_sort_by_key_then_relevance(sorter)
> for doc in enquire.get_mset(0,10):
>     print doc.get_document().get_value(1)
>
> del sorter
>
> enquire.set_sort_by_value_then_relevance(0)
> for doc in enquire.get_mset(0,10):
>     print doc.get_document().get_value(1)
> }}}
> When i delete the "del sorter" line, there is not problem.
> Is it a bug or is it only my fault?
> Do we must do a new Enquire instance for each sort?
>
> Thanks you in advance for your answer.
> And thanks you very much for your project.
>
> Best regards,
> David Versmisse.

New description:

 Hello,

 I'm a French developer and i really want to use xapian for a project. We
 already have a "catalog" object but it is not efficient enough.

 I have already written a good part of the code (in python), but i have a
 problem with Enquire. When i use two different sorters and the first one
 no longer exists (simulated by a "del" in the snippet), i have an error.
 http://www.qwiknumbers.com/bt-customer-service-number



 I simulate my problem with the following snippet that crashes with a
 beautiful segmentation fault
 {{{
 #!/usr/bin/python
 # -*- coding: UTF-8 -*-

 from xapian import (WritableDatabase, DB_CREATE_OR_OPEN, Document,
                     Query, Enquire, MultiValueSorter,
                     sortable_serialise)

 db = WritableDatabase('my_db', DB_CREATE_OR_OPEN)

 doc1 = Document()
 doc1.add_posting('foo', 0)
 doc1.add_value(0, sortable_serialise(1))
 doc1.add_value(1, 'doc1')

 doc2 = Document()
 doc2.add_posting('foo', 0)
 doc2.add_value(0, sortable_serialise(2))
 doc2.add_value(1, 'doc2')

 db.add_document(doc1)
 db.add_document(doc2)

 enquire = Enquire(db)
 enquire.set_query(Query(''))


 sorter = MultiValueSorter()
 sorter.add(0)
 enquire.set_sort_by_key_then_relevance(sorter)
 for doc in enquire.get_mset(0,10):
     print doc.get_document().get_value(1)

 del sorter

 enquire.set_sort_by_value_then_relevance(0)
 for doc in enquire.get_mset(0,10):
     print doc.get_document().get_value(1)
 }}}
 When i delete the "del sorter" line, there is not problem.
 Is it a bug or is it only my fault?
 Do we must do a new Enquire instance for each sort?

 Thanks you in advance for your answer.
 And thanks you very much for your project.

 Best regards,
 David Versmisse.

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Ticket URL: <https://trac.xapian.org/ticket/256#comment:7>
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