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Posted to github@datafusion.apache.org by "alamb (via GitHub)" <gi...@apache.org> on 2025/12/17 14:29:01 UTC
[PR] Add hashing microbenchmark `with_hashes` [datafusion]
alamb opened a new pull request, #19373:
URL: https://github.com/apache/datafusion/pull/19373
## Which issue does this PR close?
- Part of https://github.com/apache/datafusion/issues/18411
## Rationale for this change
I want to optimize hashing for StringViewArray. In order to do I would like a benchmark to show it works
## What changes are included in this PR?
Add benchmark for `with_hashes`
Run like
```shell
cargo bench --bench with_hashes
```
Note I did not add all the possible types of arrays as I don't plan to optimize othrs
## Are these changes tested?
I ran it manually
## Are there any user-facing changes?
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb commented on PR #19373:
URL: https://github.com/apache/datafusion/pull/19373#issuecomment-3670033041
Thanks @Dandandan
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "Dandandan (via GitHub)" <gi...@apache.org>.
Dandandan commented on PR #19373:
URL: https://github.com/apache/datafusion/pull/19373#issuecomment-3669179379
Let's merge and tweak if needed
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "adriangb (via GitHub)" <gi...@apache.org>.
adriangb commented on code in PR #19373:
URL: https://github.com/apache/datafusion/pull/19373#discussion_r2630902927
##########
datafusion/common/benches/with_hashes.rs:
##########
@@ -0,0 +1,209 @@
+// 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.
+
+//! Benchmarks for `with_hashes` function
+
+use ahash::RandomState;
+use arrow::array::{
+ Array, ArrayRef, ArrowPrimitiveType, DictionaryArray, GenericStringArray,
+ NullBufferBuilder, OffsetSizeTrait, PrimitiveArray, StringViewArray, make_array,
+};
+use arrow::buffer::NullBuffer;
+use arrow::datatypes::{ArrowDictionaryKeyType, Int32Type, Int64Type};
+use criterion::{Bencher, Criterion, criterion_group, criterion_main};
+use datafusion_common::hash_utils::with_hashes;
+use rand::Rng;
+use rand::SeedableRng;
+use rand::distr::{Alphanumeric, Distribution, StandardUniform};
+use rand::prelude::StdRng;
+use std::sync::Arc;
+
+const BATCH_SIZE: usize = 8192;
+
+struct BenchData {
+ name: &'static str,
+ array: ArrayRef,
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+ let pool = StringPool::new(100, 64);
Review Comment:
Nice! I had missed that
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "adriangb (via GitHub)" <gi...@apache.org>.
adriangb commented on code in PR #19373:
URL: https://github.com/apache/datafusion/pull/19373#discussion_r2629421585
##########
datafusion/common/benches/with_hashes.rs:
##########
@@ -0,0 +1,209 @@
+// 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.
+
+//! Benchmarks for `with_hashes` function
+
+use ahash::RandomState;
+use arrow::array::{
+ Array, ArrayRef, ArrowPrimitiveType, DictionaryArray, GenericStringArray,
+ NullBufferBuilder, OffsetSizeTrait, PrimitiveArray, StringViewArray, make_array,
+};
+use arrow::buffer::NullBuffer;
+use arrow::datatypes::{ArrowDictionaryKeyType, Int32Type, Int64Type};
+use criterion::{Bencher, Criterion, criterion_group, criterion_main};
+use datafusion_common::hash_utils::with_hashes;
+use rand::Rng;
+use rand::SeedableRng;
+use rand::distr::{Alphanumeric, Distribution, StandardUniform};
+use rand::prelude::StdRng;
+use std::sync::Arc;
+
+const BATCH_SIZE: usize = 8192;
+
+struct BenchData {
+ name: &'static str,
+ array: ArrayRef,
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+ let pool = StringPool::new(100, 64);
Review Comment:
Maybe could you run this 5 times locally and report back variability?
##########
datafusion/common/benches/with_hashes.rs:
##########
@@ -0,0 +1,209 @@
+// 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.
+
+//! Benchmarks for `with_hashes` function
+
+use ahash::RandomState;
+use arrow::array::{
+ Array, ArrayRef, ArrowPrimitiveType, DictionaryArray, GenericStringArray,
+ NullBufferBuilder, OffsetSizeTrait, PrimitiveArray, StringViewArray, make_array,
+};
+use arrow::buffer::NullBuffer;
+use arrow::datatypes::{ArrowDictionaryKeyType, Int32Type, Int64Type};
+use criterion::{Bencher, Criterion, criterion_group, criterion_main};
+use datafusion_common::hash_utils::with_hashes;
+use rand::Rng;
+use rand::SeedableRng;
+use rand::distr::{Alphanumeric, Distribution, StandardUniform};
+use rand::prelude::StdRng;
+use std::sync::Arc;
+
+const BATCH_SIZE: usize = 8192;
+
+struct BenchData {
+ name: &'static str,
+ array: ArrayRef,
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+ let pool = StringPool::new(100, 64);
Review Comment:
Since these pools are randomized each run, is the sample size large enough to avoid noise? If not we could always generate a single pool of strings and commit it in a txt file or something...
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "alamb (via GitHub)" <gi...@apache.org>.
alamb commented on code in PR #19373:
URL: https://github.com/apache/datafusion/pull/19373#discussion_r2630885051
##########
datafusion/common/benches/with_hashes.rs:
##########
@@ -0,0 +1,209 @@
+// 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.
+
+//! Benchmarks for `with_hashes` function
+
+use ahash::RandomState;
+use arrow::array::{
+ Array, ArrayRef, ArrowPrimitiveType, DictionaryArray, GenericStringArray,
+ NullBufferBuilder, OffsetSizeTrait, PrimitiveArray, StringViewArray, make_array,
+};
+use arrow::buffer::NullBuffer;
+use arrow::datatypes::{ArrowDictionaryKeyType, Int32Type, Int64Type};
+use criterion::{Bencher, Criterion, criterion_group, criterion_main};
+use datafusion_common::hash_utils::with_hashes;
+use rand::Rng;
+use rand::SeedableRng;
+use rand::distr::{Alphanumeric, Distribution, StandardUniform};
+use rand::prelude::StdRng;
+use std::sync::Arc;
+
+const BATCH_SIZE: usize = 8192;
+
+struct BenchData {
+ name: &'static str,
+ array: ArrayRef,
+}
+
+fn criterion_benchmark(c: &mut Criterion) {
+ let pool = StringPool::new(100, 64);
Review Comment:
WHile it is randomized, the random number generator uses a fixed seed:
```rust
pub fn make_rng() -> StdRng {
StdRng::seed_from_u64(42)
}
```
So the same strings are used each time.
I double checked the strings are the same each run by printing them out to confirm.
```diff
diff --git a/datafusion/common/benches/with_hashes.rs b/datafusion/common/benches/with_hashes.rs
index 8154c20df..56b970fdc 100644
--- a/datafusion/common/benches/with_hashes.rs
+++ b/datafusion/common/benches/with_hashes.rs
@@ -41,6 +41,7 @@ struct BenchData {
fn criterion_benchmark(c: &mut Criterion) {
let pool = StringPool::new(100, 64);
+ println!("StringPool strings:\n{:#?}", pool.strings);
// poll with small strings for string view tests (<=12 bytes are inlined)
let small_pool = StringPool::new(100, 5);
let cases = [
@@ -139,6 +140,7 @@ pub fn make_rng() -> StdRng {
}
/// String pool for generating low cardinality data (for dictionaries and string views)
+#[derive(Debug)]
struct StringPool {
strings: Vec<String>,
}
```
<details>
<summary>Run 1</summary>
```
StringPool strings:
[
"hPi3oZCna",
"Pi3oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdD",
"i3oZCnaWvL2oIeA0",
"3oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ",
"oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM4",
"ZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFW",
"ZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOW",
"CnaWvL2oIeA07mg3ZtJzh0NoAK",
"CnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOW",
"naW",
"aWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTc",
"WvL2oIeA07mg3ZtJzh0NoAKhdDq",
"vL2oIeA07mg3ZtJzh0NoAKh",
"L2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM",
"2oIeA07mg3Zt",
"oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzO",
"IeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZK",
"eA07mg3Zt",
"A07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWT",
"0",
"7mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkY",
"mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
"g3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM",
"3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZ",
"ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCy",
"tJzh0NoAKhdDqpQ2dfgaDFWTcI",
"Jzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWk",
"zh0NoAKhdD",
"h0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCy",
"0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM47",
"NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym4c",
"oAKhdDqpQ2dfga",
"AKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkY",
"K",
"hdDqpQ2dfga",
"dDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppz",
"DqpQ2dfgaDFWTcIylNhZKp3bM477b3",
"qpQ2",
"pQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
"Q2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
"2dfgaDFWTcIylNhZK",
"dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28",
"fgaDFWTcIylNhZKp3bM477b3ppzOWk",
"gaDFWTcIylNhZKp3bM477b3ppzOWkYYm",
"gaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ",
"aDFWTcIylNhZKp3bM477b3ppzOWkYYmEG",
"DFWTcIylNhZKp3bM477b3ppzOWk",
"FWTc",
"WTcIyl",
"TcIylNhZKp3bM477b3ppzOW",
"cIylNhZKp3bM477b3ppz",
"IylNhZKp3bM477b3ppzOWkYYmEGbC",
"ylNhZKp3b",
"lNhZKp3bM477b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2",
"NhZKp3bM477b3ppzOWkYYmEGbCym4cPB4JQYAf",
"hZKp3bM477b3pp",
"ZKp3bM477b3ppzOWkYYmEGbCym4cPB4JQY",
"Kp3bM477b3ppzOWkYYmEGbCym4",
"p3bM477b3pp",
"3bM477b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xy",
"bM477b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe7",
"M477b3ppzOWkYYmEGbCym4cPB4JQ",
"477b3ppzOWkYY",
"77b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798Kv",
"7b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJio",
"b3ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJioH",
"3ppzOWkYYmEGbCym4cPB4JQYAfz9",
"ppzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJi",
"pzOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9",
"zOWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P",
"OWkYYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJ",
"WkYYmEGbCym4cPB",
"kYYmEGbCym4cPB4JQYAfz9f",
"YYmEGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9",
"YmEGbCym4cPB4JQYAfz9f28i8",
"mEGbCym4cPB4JQYAfz9f28i8x",
"EGbCym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe",
"GbCym",
"bCym4cP",
"Cym4cPB4JQYAfz9f28i8xyzk2PYZ",
"ym4",
"ym4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkN",
"m4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2",
"4cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798Kvd",
"cPB4JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny",
"PB4JQYAfz9f28i8xyzk2PYZ4O9P4o",
"B4JQYAfz9f28i8xy",
"4J",
"JQYAfz9f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkN",
"QYAfz9f28i",
"YAfz9f28i8xyzk2PY",
"Afz9f28i8xyzk2PYZ4O9P4oTe",
"f",
"z9f28i8xyzk2PYZ4O9P4oTe798KvdJio",
"9f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkNf",
"f28i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkNfucH7zCQf1wj",
"28i8xyzk2PYZ4O9P4oTe798KvdJioHjV",
"8i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkNfucH7zC",
"i8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2rSDte9ny3QkNfucH7zCQf1wjUe",
"8xyzk2PYZ4O9P4oTe798KvdJioHjVwPSk2r",
]
```
</details>
<details>
<summary>Run 2</summary>
```
StringPool strings:
[
"hPi3oZCna",
"Pi3oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdD",
"i3oZCnaWvL2oIeA0",
"3oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ",
"oZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM4",
"ZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFW",
"ZCnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOW",
"CnaWvL2oIeA07mg3ZtJzh0NoAK",
"CnaWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOW",
"naW",
"aWvL2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTc",
"WvL2oIeA07mg3ZtJzh0NoAKhdDq",
"vL2oIeA07mg3ZtJzh0NoAKh",
"L2oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM",
"2oIeA07mg3Zt",
"oIeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzO",
"IeA07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZK",
"eA07mg3Zt",
"A07mg3ZtJzh0NoAKhdDqpQ2dfgaDFWT",
"0",
"7mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkY",
"mg3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
"g3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM",
"3ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZ",
"ZtJzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCy",
"tJzh0NoAKhdDqpQ2dfgaDFWTcI",
"Jzh0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWk",
"zh0NoAKhdD",
"h0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCy",
"0NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM47",
"NoAKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym4c",
"oAKhdDqpQ2dfga",
"AKhdDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkY",
"K",
"hdDqpQ2dfga",
"dDqpQ2dfgaDFWTcIylNhZKp3bM477b3ppz",
"DqpQ2dfgaDFWTcIylNhZKp3bM477b3",
"qpQ2",
"pQ2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
"Q2dfgaDFWTcIylNhZKp3bM477b3ppzOWkYYmEGbCym",
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</details>
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Re: [PR] Add hashing microbenchmark `with_hashes` [datafusion]
Posted by "Dandandan (via GitHub)" <gi...@apache.org>.
Dandandan merged PR #19373:
URL: https://github.com/apache/datafusion/pull/19373
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