[Xapian-tickets] [Xapian] #654: Getting EOF when using get_data() in a remote database

[Xapian]

#654: Getting EOF when using get_data() in a remote database
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 Reporter:  Kronuz         |             Owner:  olly
     Type:  defect         |            Status:  assigned
 Priority:  normal         |         Milestone:  1.3.3
Component:  Backend-Chert  |           Version:  1.2.18
 Severity:  normal         |        Resolution:
 Keywords:                 |        Blocked By:
 Blocking:                 |  Operating System:  All
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Comment (by olly):

 I had a look at the "find_entry failed to find any entry at all!" error
 and I think I may have spotted a bug which could explain at least some of
 this.

 If we try to move the cursor to a key which isn't present, we ought to
 leave the cursor on the highest key < the request one.  And there's a
 special item with a "null key" which is always present, so it should
 always be possible to leave the cursor positioned on an item.  However, it
 looks like you can't call `component_of()` on the item with the null key,
 but in some situations while positioning the cursor on the key before we
 try to.

 This almost explains the issue with the negative key length too, except
 that I think the key length would be reported as `-2` and not `-3`.  I'll
 run some tests to check I'm reading the code correctly, and try to resolve
 this.

 A backtrace of the callstack leading to situation where the key length of
 -3 is returned would still be very helpful.

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Ticket URL: <http://trac.xapian.org/ticket/654#comment:6>
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