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early type checks in RowConverter#3080

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tustvold merged 4 commits into
apache:masterfrom
crepererum:crepererum/issue3077
Nov 10, 2022
Merged

early type checks in RowConverter#3080
tustvold merged 4 commits into
apache:masterfrom
crepererum:crepererum/issue3077

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@crepererum

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Which issue does this PR close?

Closes #3077.

Rationale for this change

  1. There should be an easy way to check if a row format supports a certain type before conversion. This can be useful for DataFusion, where certain decisions are made during planning time.
  2. Improve RowConverter API by implementing "if you can create it, you can also feed data into it (modulo overflows)".

What changes are included in this PR?

  • RowConverter::supports_fields to check if fields are supported by row format
  • RowConverter::new can now fail
  • Small clean (remove unnecessary match arm)

Are there any user-facing changes?

BREAKING CHANGE: RowConverter::new can now fail

Decimal types are already handled by `downcast_primitive`.
Check supported row format types when creating the converter instead of
during conversion. Also add an additional method
`RowConverter::supports_fields` to check types w/o relying on an error.

Closes apache#3077.
@github-actions github-actions Bot added the arrow Changes to the arrow crate label Nov 10, 2022
Comment thread arrow/src/row/mod.rs Outdated
/// Check if the given fields are supported by the row format.
pub fn supports_fields(fields: &[SortField]) -> bool {
for f in fields {
let data_type = &f.data_type;

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I think this can be simplified to something like

match data_type {
    DataType::Dictionary(_, v) => !DataType::is_nested(v.as_ref()),
    _ => !DataType::is_nested(data_type),
}

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#3083 will make this even simpler

@tustvold tustvold added the api-change Changes to the arrow API label Nov 10, 2022
@tustvold

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I took the liberty of simplifying this so it can make the arrow release

@tustvold tustvold merged commit 8d364fe into apache:master Nov 10, 2022
@ursabot

ursabot commented Nov 10, 2022

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Benchmark runs are scheduled for baseline = ed20bf1 and contender = 8d364fe. 8d364fe 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

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Row Format: API to check if datatypes are supported

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