comphead commented on code in PR #13280: URL: https://github.com/apache/datafusion/pull/13280#discussion_r1833584521
########## test-utils/src/array_gen/binary.rs: ########## @@ -0,0 +1,94 @@ +// 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::array::{ + ArrayRef, BinaryViewArray, GenericBinaryArray, OffsetSizeTrait, UInt32Array, +}; +use arrow::compute; +use rand::rngs::StdRng; +use rand::Rng; + +/// Randomly generate binary arrays +pub struct BinaryArrayGenerator { + /// The maximum length of each binary element + pub max_len: usize, + /// The total number of binaries in the output + pub num_binaries: usize, + /// The number of distinct binary values in the columns + pub num_distinct_binaries: usize, + /// The percentage of nulls in the columns + pub null_pct: f64, + /// Random number generator + pub rng: StdRng, +} + +impl BinaryArrayGenerator { + /// Creates a BinaryArray or LargeBinaryArray with random binary data. + pub fn gen_data<O: OffsetSizeTrait>(&mut self) -> ArrayRef { + let distinct_binaries: GenericBinaryArray<O> = (0..self.num_distinct_binaries) + .map(|_| Some(random_binary(&mut self.rng, self.max_len))) + .collect(); + + // Pick num_binaries randomly from the distinct binary table + let indices: UInt32Array = (0..self.num_binaries) + .map(|_| { + if self.rng.gen::<f64>() < self.null_pct { + None + } else if self.num_distinct_binaries > 1 { + let range = 0..(self.num_distinct_binaries as u32); + Some(self.rng.gen_range(range)) + } else { + Some(0) + } + }) + .collect(); + + compute::take(&distinct_binaries, &indices, None).unwrap() + } + + /// Creates a BinaryViewArray with random binary data. + pub fn gen_binary_view(&mut self) -> ArrayRef { + let distinct_binary_views: BinaryViewArray = (0..self.num_distinct_binaries) + .map(|_| Some(random_binary(&mut self.rng, self.max_len))) + .collect(); + + let indices: UInt32Array = (0..self.num_binaries) + .map(|_| { + if self.rng.gen::<f64>() < self.null_pct { + None + } else if self.num_distinct_binaries > 1 { + let range = 0..(self.num_distinct_binaries as u32); + Some(self.rng.gen_range(range)) + } else { + Some(0) + } + }) + .collect(); + + compute::take(&distinct_binary_views, &indices, None).unwrap() + } +} + +/// Return a binary vector of random bytes of length 1..=max_len +fn random_binary(rng: &mut StdRng, max_len: usize) -> Vec<u8> { + if max_len == 0 { + Vec::new() + } else { + let len = rng.gen_range(1..=max_len); + (0..len).map(|_| rng.gen()).collect() Review Comment: wondering if `len` differs from `max_len`? -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
