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Dont call multiunzip when no stats #9220

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matthewmturner
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Which issue does this PR close?

Closes #9219

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

@github-actions github-actions bot added the core Core DataFusion crate label Feb 13, 2024
@@ -234,7 +234,7 @@ fn criterion_benchmark(c: &mut Criterion) {
let sql = std::fs::read_to_string(format!("../../benchmarks/queries/{}.sql", q))
.unwrap();
c.bench_function(&format!("physical_plan_tpch_{}", q), |b| {
b.iter(|| logical_plan(&ctx, &sql))
b.iter(|| physical_plan(&ctx, &sql))
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There was disconnect between benchmark name (physical plan) and the function(logical plan), so I corrected this

@matthewmturner matthewmturner marked this pull request as ready for review February 13, 2024 20:41
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@alamb alamb left a comment

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Thank you @matthewmturner and @Dandandan

@@ -35,6 +35,7 @@ pub async fn get_statistics_with_limit(
all_files: impl Stream<Item = Result<(PartitionedFile, Statistics)>>,
file_schema: SchemaRef,
limit: Option<usize>,
collect_stats: bool,
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Given the function is called 'get_statisticsand now there is a boolean flag that implies the stats aren't collected, can we please add some documentation to the docstring explaining what thecollect_stats` flag does?

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Yes good catch, will do.

@matthewmturner
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@alamb I have updated the docstring. let me know if anything else

@alamb alamb merged commit 8aaea5d into apache:main Feb 15, 2024
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alamb commented Feb 15, 2024

Thanks again @matthewmturner !

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Improve performance of list_files_for_scan when not collecting statistics
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