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return reference from DictionaryArray::values() (#313) #314

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merged 1 commit into from
May 21, 2021

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tustvold
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@tustvold tustvold commented May 17, 2021

Which issue does this PR close?

Closes #313.

Rationale for this change

See ticket, but in short it allows borrow lifetimes to correctly propagate without creating issues around stack-local temporaries

Are there any user-facing changes?

As currently formulated this is a breaking change, but it could easily be reworked to not be if preferred.

EDIT: I don't seem to have permission to add the breaking change label as instructed by the placeholder text

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LGTM. Yeap, fully agree 👍

Signed-off-by: Raphael Taylor-Davies <r.taylordavies@googlemail.com>
@tustvold tustvold force-pushed the dictionary-values-reference branch from d5cffcd to 6217913 Compare May 17, 2021 18:03
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@jorgecarleitao Rebased to fix accidental formatting change, you were faster than anticipated :D

@alamb alamb added the arrow Changes to the arrow crate label May 17, 2021
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alamb commented May 17, 2021

This is probably technically a "breaking" change as some code that used to compile will no longer...

@alamb alamb added the api-change Changes to the arrow API label May 17, 2021
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Nice! While we're looking at the DictionaryArray and introducing api changes, we should also remove the keys_array method since the same functionality is now provided by the keys method. The keys_array has measurable overhead when used in inner loops also due to clones. Some time ago, keys only returned an iterator and keys_array had its uses, but now it's fully redundant.

@alamb alamb merged commit 71c2159 into apache:master May 21, 2021
alamb pushed a commit to alamb/arrow-rs that referenced this pull request May 22, 2021
)

Signed-off-by: Raphael Taylor-Davies <r.taylordavies@googlemail.com>
alamb pushed a commit to alamb/arrow-rs that referenced this pull request May 22, 2021
)

Signed-off-by: Raphael Taylor-Davies <r.taylordavies@googlemail.com>
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DictionaryArray::values() clones the underlying ArrayRef
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