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Add support for TREAT operator #120

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beikov opened this issue Apr 25, 2015 · 6 comments
Closed

Add support for TREAT operator #120

beikov opened this issue Apr 25, 2015 · 6 comments

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@beikov
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@beikov beikov commented Apr 25, 2015

JPA 2.1 introduced the TREAT operator and we should add support for that in the parser and the API.

@beikov beikov self-assigned this Apr 25, 2015
@beikov beikov added this to the 1.0.1 milestone Apr 25, 2015
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@beikov beikov commented Apr 26, 2015

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@beikov beikov commented Apr 28, 2015

Treat is allowed to be used as

  • join path expression
  • normal path expression

We have to reflect that in the grammar

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@beikov beikov added this to the 1.0.2 milestone May 20, 2015
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@beikov beikov assigned Mobe91 and unassigned beikov Feb 19, 2016
@beikov beikov assigned beikov and unassigned Mobe91 Aug 3, 2016
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@beikov beikov commented Aug 23, 2016

I created a testsuite for treat operator testing and started dicussions in the forums of EclipseLink and Hibernate. Let's see what they say before we start implementing something.

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@beikov beikov commented Sep 6, 2016

I implemented rudimental treat support in the core: 1d3fd3c
Since hibernate and datanucleus implement implicit subtype property resolving, most cases can work without rendering the treat through to the final query.
The edge cases described in the testsuite could actually be fixed or at least be handled in a deterministic way, but I'd rather wait for a request for it or a statement from the EclipeLink or Hibernate community regarding the treat issues.

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@beikov beikov commented Sep 6, 2016

Also note that #123 contains the explanation of a workaround for some treat limitations.

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@beikov beikov commented Feb 12, 2017

  • Integrate tests from the jpa-treat-variations repository
  • Implement workarounds for making tests work Deferring as Hibernate can handle all cases
  • Implement criteria support
  • Documentation
  • Create tests that use a TREAT as fetch parent for fetchOnly()

Notes for possible workaround implementations

  • We could introduce virtual predicates that contain TREAT expressions for other subtypes to workaround premature subtype filtering issues

Notes about limitations

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@beikov beikov closed this in d0a7785 Apr 20, 2017
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