Dandandan commented on code in PR #7043: URL: https://github.com/apache/arrow-datafusion/pull/7043#discussion_r1269874826
########## datafusion/core/src/physical_plan/aggregates/group_values/primitive.rs: ########## @@ -0,0 +1,191 @@ +// 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 crate::physical_plan::aggregates::group_values::GroupValues; +use ahash::RandomState; +use arrow::array::BooleanBufferBuilder; +use arrow::buffer::NullBuffer; +use arrow::datatypes::i256; +use arrow_array::cast::AsArray; +use arrow_array::{ArrayRef, ArrowNativeTypeOp, ArrowPrimitiveType, PrimitiveArray}; +use arrow_schema::DataType; +use datafusion_common::Result; +use datafusion_execution::memory_pool::proxy::VecAllocExt; +use datafusion_physical_expr::EmitTo; +use half::f16; +use hashbrown::raw::RawTable; +use std::sync::Arc; + +/// A trait to allow hashing of floating point numbers +trait HashValue { + fn hash(self, state: &RandomState) -> u64; +} + +macro_rules! hash_integer { + ($($t:ty),+) => { + $(impl HashValue for $t { + fn hash(self, state: &RandomState) -> u64 { + state.hash_one(self) + } + })+ + }; +} +hash_integer!(i8, i16, i32, i64, i128, i256); +hash_integer!(u8, u16, u32, u64); + +macro_rules! hash_float { + ($($t:ty),+) => { + $(impl HashValue for $t { + fn hash(self, state: &RandomState) -> u64 { + state.hash_one(self.to_bits()) + } + })+ + }; +} + +hash_float!(f16, f32, f64); + +/// A [`GroupValues`] storing raw primitive values +pub struct GroupValuesPrimitive<T: ArrowPrimitiveType> { + /// The data type of the output array + data_type: DataType, + /// Stores the group index based on the hash of its value + map: RawTable<usize>, + /// The group index of the null value if any + null_group: Option<usize>, + /// The values for each group index + values: Vec<T::Native>, + /// The random state used to generate hashes + random_state: RandomState, +} + +impl<T: ArrowPrimitiveType> GroupValuesPrimitive<T> { + pub fn new(data_type: DataType) -> Self { + assert!(PrimitiveArray::<T>::is_compatible(&data_type)); + Self { + data_type, + map: RawTable::with_capacity(128), + values: Vec::with_capacity(128), + null_group: None, + random_state: Default::default(), + } + } +} + +impl<T: ArrowPrimitiveType> GroupValues for GroupValuesPrimitive<T> +where + T::Native: HashValue, +{ + fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec<usize>) -> Result<()> { + assert_eq!(cols.len(), 1); + groups.clear(); + + for v in cols[0].as_primitive::<T>() { + let group_id = match v { + None => *self.null_group.get_or_insert_with(|| { + let group_id = self.values.len(); + self.values.push(Default::default()); + group_id + }), + Some(key) => { + let state = &self.random_state; + let hash = key.hash(state); + let insert = self.map.find_or_find_insert_slot( + hash, + |g| unsafe { self.values.get_unchecked(*g).is_eq(key) }, Review Comment: this is awesome 🚀 ########## datafusion/core/src/physical_plan/aggregates/group_values/primitive.rs: ########## @@ -0,0 +1,191 @@ +// 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 crate::physical_plan::aggregates::group_values::GroupValues; +use ahash::RandomState; +use arrow::array::BooleanBufferBuilder; +use arrow::buffer::NullBuffer; +use arrow::datatypes::i256; +use arrow_array::cast::AsArray; +use arrow_array::{ArrayRef, ArrowNativeTypeOp, ArrowPrimitiveType, PrimitiveArray}; +use arrow_schema::DataType; +use datafusion_common::Result; +use datafusion_execution::memory_pool::proxy::VecAllocExt; +use datafusion_physical_expr::EmitTo; +use half::f16; +use hashbrown::raw::RawTable; +use std::sync::Arc; + +/// A trait to allow hashing of floating point numbers +trait HashValue { + fn hash(self, state: &RandomState) -> u64; +} + +macro_rules! hash_integer { + ($($t:ty),+) => { + $(impl HashValue for $t { + fn hash(self, state: &RandomState) -> u64 { + state.hash_one(self) + } + })+ + }; +} +hash_integer!(i8, i16, i32, i64, i128, i256); +hash_integer!(u8, u16, u32, u64); + +macro_rules! hash_float { + ($($t:ty),+) => { + $(impl HashValue for $t { + fn hash(self, state: &RandomState) -> u64 { + state.hash_one(self.to_bits()) + } + })+ + }; +} + +hash_float!(f16, f32, f64); + +/// A [`GroupValues`] storing raw primitive values +pub struct GroupValuesPrimitive<T: ArrowPrimitiveType> { + /// The data type of the output array + data_type: DataType, + /// Stores the group index based on the hash of its value + map: RawTable<usize>, + /// The group index of the null value if any + null_group: Option<usize>, + /// The values for each group index + values: Vec<T::Native>, + /// The random state used to generate hashes + random_state: RandomState, +} + +impl<T: ArrowPrimitiveType> GroupValuesPrimitive<T> { + pub fn new(data_type: DataType) -> Self { + assert!(PrimitiveArray::<T>::is_compatible(&data_type)); + Self { + data_type, + map: RawTable::with_capacity(128), + values: Vec::with_capacity(128), + null_group: None, + random_state: Default::default(), + } + } +} + +impl<T: ArrowPrimitiveType> GroupValues for GroupValuesPrimitive<T> +where + T::Native: HashValue, +{ + fn intern(&mut self, cols: &[ArrayRef], groups: &mut Vec<usize>) -> Result<()> { + assert_eq!(cols.len(), 1); + groups.clear(); + + for v in cols[0].as_primitive::<T>() { + let group_id = match v { + None => *self.null_group.get_or_insert_with(|| { + let group_id = self.values.len(); + self.values.push(Default::default()); + group_id + }), + Some(key) => { + let state = &self.random_state; + let hash = key.hash(state); + let insert = self.map.find_or_find_insert_slot( + hash, + |g| unsafe { self.values.get_unchecked(*g).is_eq(key) }, Review Comment: this is awesome 🚀 -- This is an automated message from the Apache Git Service. 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