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refactor: convert Field::metadata to HashMap #3148

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merged 2 commits into from Nov 21, 2022
Merged

refactor: convert Field::metadata to HashMap #3148

merged 2 commits into from Nov 21, 2022

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crepererum
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@crepererum crepererum commented Nov 21, 2022 •
edited by tustvold

Which issue does this PR close?

Closes #2262.
Closes #3086

Rationale for this change

Consistent metadata types, smaller memory footprint, easier size calculations (see #3147).

What changes are included in this PR?

Field::metadata is now a HashMap instead of a BTreeMap.

Are there any user-facing changes?

⚠️ Breaking Change: Type changed. Iteration order is now undefined.

@github-actions github-actions bot added arrow Changes to the arrow crate parquet Changes to the parquet crate labels Nov 21, 2022
@crepererum crepererum mentioned this pull request Nov 21, 2022
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@tustvold tustvold added the api-change Changes to the arrow API label Nov 21, 2022
tustvold
tustvold reviewed Nov 21, 2022
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arrow-schema/src/field.rs Outdated
match (self.metadata.get(k), other.metadata.get(k)) {
(None, None) => {}
(Some(_), None) => {
return Ordering::Greater;
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Is this the correct way round?

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Technically this doesn't matter since HashMaps aren't ordered by default, so "who goes first" is implementation-defined by arrow, but I'll add a test.

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done

tustvold
tustvold reviewed Nov 21, 2022
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I'm not sure that the Ord implementation is correct, I'm also not sure we actually have any tests of it...

I would feel more comfortable with this, if we had a test that verified this

tustvold
tustvold reviewed Nov 21, 2022
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arrow-schema/src/field.rs Outdated Show resolved Hide resolved
@crepererum @tustvold
refactor: code formatting
7818f60 
Co-authored-by: Raphael Taylor-Davies <1781103+tustvold@users.noreply.github.com>
@tustvold tustvold merged commit 57f91f2 into apache:master Nov 21, 2022
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ursabot commented Nov 21, 2022

Benchmark runs are scheduled for baseline = 6f8187f and contender = 57f91f2. 57f91f2 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java

This was referenced Nov 25, 2022
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Change Field::metadata to HashMap Encode Field and Schema metadata using the same type
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