Following error comes from BaseX version 7.5, but it seems to exist also on 7.6:

We have a query that uses collection: ("suuryritys" stands for "big company"):

collection('suuryritys_com/suuryritys.com/data/ou')//*[@cat='production']

When evaluated on basexgui (or via C# api), the query evaluates, i.e. the database is opened, document (/suuryritys.com/data/ou) is opened ,data
fetched and database closed.

But, when we try to evaluate the query using either xquery:eval or xquery:invoke

xquery:eval("collection('suuryritys_com/suuryritys.com/data/ou')//*[@cat='production']")

instead of result, we get error message:


Error: Improper use? Potential bug? Your feedback is welcome:
Contact: basex-talk@mailman.uni-konstanz.de
Version: BaseX 7.5
Java: Oracle Corporation, 1.7.0_02
OS: Linux, i386
Stack Trace:
java.lang.ArrayIndexOutOfBoundsException: 57
  org.basex.util.Compress.pull(Compress.java:139)
  org.basex.util.Compress.unpack(Compress.java:113)
  org.basex.data.DiskData.txt(DiskData.java:268)
  org.basex.data.DiskData.text(DiskData.java:235)
  org.basex.io.serial.Serializer.node(Serializer.java:389)
  org.basex.io.serial.Serializer.serialize(Serializer.java:99)
  org.basex.io.serial.Serializer.serialize(Serializer.java:84)
  org.basex.query.iter.ValueBuilder.serialize(ValueBuilder.java:80)
  org.basex.query.iter.ValueBuilder.serialize(ValueBuilder.java:75)
  org.basex.core.cmd.AQuery.query(AQuery.java:91)
  org.basex.core.cmd.XQuery.run(XQuery.java:22)
  org.basex.core.Command.run(Command.java:342)
  org.basex.core.Command.exec(Command.java:321)
  org.basex.core.Command.execute(Command.java:78)
  org.basex.gui.GUI.exec(GUI.java:389)
  org.basex.gui.GUI$6.run(GUI.java:343)


Query: xquery:invoke("invoke-file.xq")
Query plan:
<QueryPlan>
  <FNXQuery name="invoke(string[,bindings])">
    <Str value="invoke-file.xq" type="xs:string"/>
  </FNXQuery>
</QueryPlan>

Same error comes, when the query is on a text file, and it is evaluated with xquery:invoke.

The funny part is, if the database (suuryritys_com) is opened by hand (on BaseXGui's command line with "open suuryritys_com"), the query returns the
result. It also seems, that if I first open some other database, then close it, and then open the database suuryritys_com, I get the same error.

--
Arto Viitanen
Microteam Oy
Finland

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