xudong963 commented on code in PR #15473: URL: https://github.com/apache/datafusion/pull/15473#discussion_r2018831008
########## datafusion/datasource/benches/split_groups_by_statistics.rs: ########## @@ -0,0 +1,178 @@ +// Licensed to the Apache Software Foundation (ASF) under one +// or more contributor license agreements. See the NOTICE file +// distributed with this work for additional information +// regarding copyright ownership. The ASF licenses this file +// to you under the Apache License, Version 2.0 (the +// "License"); you may not use this file except in compliance +// with the License. You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, +// software distributed under the License is distributed on an +// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY +// KIND, either express or implied. See the License for the +// specific language governing permissions and limitations +// under the License. + +use arrow::datatypes::{DataType, Field, Schema}; +use criterion::{criterion_group, criterion_main, BenchmarkId, Criterion}; +use datafusion_common::stats::Precision; +use datafusion_common::{ColumnStatistics, ScalarValue, Statistics}; +use datafusion_datasource::file_groups::FileGroup; +use datafusion_datasource::file_scan_config::FileScanConfig; +use datafusion_datasource::PartitionedFile; +use datafusion_physical_expr::PhysicalSortExpr; +use datafusion_physical_expr_common::sort_expr::LexOrdering; +use object_store::{path::Path, ObjectMeta}; +use std::sync::Arc; +use std::time::Duration; + +/// Generates test files with min-max statistics in different overlap patterns +fn generate_test_files(num_files: usize, overlap_factor: f64) -> Vec<FileGroup> { + let mut files = Vec::with_capacity(num_files); + let range_size = if overlap_factor == 0.0 { + 100 / num_files as i64 + } else { + (100.0 / (overlap_factor * num_files as f64)).max(1.0) as i64 + }; + + for i in 0..num_files { + let base = (i as f64 * range_size as f64 * (1.0 - overlap_factor)) as i64; + let min = base as f64; + let max = (base + range_size) as f64; + + let file = PartitionedFile { + object_meta: ObjectMeta { + location: Path::from(format!("file_{}.parquet", i)), + last_modified: chrono::Utc::now(), + size: 1000, + e_tag: None, + version: None, + }, + partition_values: vec![], + range: None, + statistics: Some(Statistics { + num_rows: Precision::Exact(100), + total_byte_size: Precision::Exact(1000), + column_statistics: vec![ColumnStatistics { + null_count: Precision::Exact(0), + max_value: Precision::Exact(ScalarValue::Float64(Some(max))), + min_value: Precision::Exact(ScalarValue::Float64(Some(min))), + sum_value: Precision::Absent, + distinct_count: Precision::Absent, + }], + }), + extensions: None, + metadata_size_hint: None, + }; + files.push(file); + } + + vec![FileGroup::new(files)] +} + +pub fn compare_split_groups_by_statistics_algorithms(c: &mut Criterion) { Review Comment: > Would be great to have some example of this. The impact on planning time seems not super high. Yes, fyi: https://github.com/apache/datafusion/issues/10336#issuecomment-2246022064 And I think @leoyvens can ouput more -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: github-unsubscr...@datafusion.apache.org For additional commands, e-mail: github-h...@datafusion.apache.org
