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No static typing #5673

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@line-o line-o commented Mar 16, 2025 •
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Description:

fixes #2445

Reference:

Type of tests:

XQSuite tests

@line-o line-o requested a review from a team as a code owner March 16, 2025 19:11
dizzzz
dizzzz requested changes Mar 16, 2025
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Build is failing;
can we add tests eg from the original bug report?

@dizzzz dizzzz requested review from wolfgangmm and a team March 16, 2025 20:02
@line-o line-o force-pushed the no-static-typing branch 2 times, most recently from 06f4eea to a12a11e Compare March 16, 2025 20:56
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line-o commented Mar 16, 2025

I applied commits from an older PR that targeted develop-6.x.x and it took 3 attempts to get it to compile.
I will look to add one or two tests from the original issue.

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line-o commented Mar 16, 2025

I would expect for one to many additional XQTS test cases to now pass.

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line-o commented Mar 16, 2025

There seems to be zero tests that assert error XPST0005 to be raised. ;)

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dizzzz commented Mar 17, 2025

I am wondering.... should this code change be 'protected' to it would not be effective for 'query 3.1' (and older) based queries?

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line-o commented Mar 17, 2025 •
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The error with code XPST0005 should only be raised when a XQuery processor implements the static typing feature.

exist-db never claimed to support this optional feature, which is why I believe we do not need to guard against it.
I do agree that one can argue it is a breaking change which is why I ported my original PR #3653 to target exist 7 instead.

With this PR applied XPath queries will behave much more like in any other Xquery processor (namely baseX and Saxon).

line-o added 2 commits March 17, 2025 19:16
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[refactor] ContextItemExpression uses staticReturnType
9fd4ff8 
Turns out, a property for the static return type is already defined by
the Step super class.
ContextItemExpression uses this now and its own returnType property is
removed.
@line-o
[fix] simple predicates evaluating to empty sequences
21027f3 
Fixes eXist-db#2445

By definition the following Xpaths must evaluate to an empty sequence
- `<a/>[self::b]`
- `<a/>/@b/c`
- `<a/>/text()/b`

Instead of throwing an Exception the staticReturnType of the current step
and the contextInfo returnType are set to Type.EMPTY.
@line-o line-o force-pushed the no-static-typing branch from a12a11e to 48082b2 Compare March 17, 2025 18:18
@line-o line-o mentioned this pull request Mar 17, 2025
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@line-o line-o force-pushed the no-static-typing branch 2 times, most recently from 9e66d95 to 773a278 Compare March 17, 2025 20:02
[test] add tests to ensure no static typing
51e4984 
refs eXist-db#2445
These tests aim to ensure that certain XPath expressions no longer raise error XPST0005 as exist-db does not implement
the static typing feature and this feature is even dropped entirely with the next version of XQuery.
@line-o line-o force-pushed the no-static-typing branch from 773a278 to 51e4984 Compare March 17, 2025 20:10
@line-o line-o requested a review from dizzzz March 17, 2025 21:42
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dizzzz approved these changes Mar 18, 2025
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as discussed in telco

@dizzzz dizzzz requested review from reinhapa and a team March 20, 2025 16:10
@dizzzz dizzzz requested a review from a team March 24, 2025 10:28
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duncdrum approved these changes Mar 24, 2025
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as discussed needs documentation

@line-o line-o added the needs documentation Signals issues or PRs that will require an update to the documentation repo label Apr 15, 2025
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self:: axis inside predicate throws XPST0005
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