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Bug #4134

XQuery: default collation and starts-with causes fatal error cannot be cast to net.sf.saxon.lib.SubstringMatcher

Added by Boris Lehečka 7 months ago. Updated 6 months ago.

Status:
Closed
Priority:
Normal
Assignee:
Category:
Internals
Sprint/Milestone:
-
Start date:
2019-02-13
Due date:
% Done:

100%

Legacy ID:
Applies to branch:
9.9, trunk
Fix Committed on Branch:
9.9, trunk
Fixed in Maintenance Release:

Description

When default collation is declared, using starts-with function with two parameters, i.e. starts-with($arg1, $arg2), causes the error net.sf.saxon.expr.sort.SimpleCollation cannot be cast to net.sf.saxon.lib.SubstringMatcher.

There are two solutions:

  1. removing default collation declaration
  2. adding collation argument to starts-with function, for example starts-with($arg1, $arg2, "http://saxon.sf.net/collation?lang=cs-CZ")

I would expect that default collation is used for comparison within starts-with function without "redefining" it.

Am I wrong?

Example file with commented code is attached.

collation-error.xquery (414 Bytes) default collation and starts-with error example Boris Lehečka, 2019-02-13 11:14 collation-error.xquery

History

#1 Updated by Michael Kay 7 months ago

Thanks for reporting it. There's logic for handling substring matching using such collations when explicitly specified in the argument to substring(), but the logic is missing for the case where it's the default collation.

By the way, I would suggest that you switch to using the standardized collation URIs such as

http://www.w3.org/2013/collation/UCA?lang=cs-CZ;fallback=yes

in place of the Saxon-specific collation URIs.

I have to say that I have found the effect of using functions like starts-with() and contains() with collations that ignore some characters like spaces and hyphens pretty hard to comprehend.

#2 Updated by Michael Kay 7 months ago

  • Category set to Internals
  • Status changed from New to Resolved
  • Assignee set to Michael Kay
  • Priority changed from Low to Normal
  • Applies to branch 9.9, trunk added
  • Applies to branch deleted (9.8)
  • Fix Committed on Branch 9.9, trunk added

Fix committed on the 9.9 and development branches.

#3 Updated by Michael Kay 7 months ago

Added test cases to QT3 test set "prod-DefaultCollationDecl" and to XSLT3 test set "collations"

#4 Updated by O'Neil Delpratt 6 months ago

  • Status changed from Resolved to Closed
  • % Done changed from 0 to 100
  • Fixed in Maintenance Release 9.9.1.2 added

Bug issue fixed in the Saxon 9.9.1.2 maintenance release.

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