houqp commented on a change in pull request #7324: URL: https://github.com/apache/arrow/pull/7324#discussion_r436252687
########## File path: rust/arrow/src/compute/kernels/concat.rs ########## @@ -0,0 +1,395 @@ +// 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. + +//! Defines concat kernel for `ArrayRef` +//! +//! Example: +//! +//! ``` +//! use std::sync::Arc; +//! use arrow::array::{ArrayRef, StringArray}; +//! use arrow::compute::concat; +//! +//! let arr = concat(&vec![ +//! Arc::new(StringArray::from(vec!["hello", "world"])) as ArrayRef, +//! Arc::new(StringArray::from(vec!["!"])) as ArrayRef, +//! ]).unwrap(); +//! assert_eq!(arr.len(), 3); +//! ``` + +use std::sync::Arc; + +use crate::array::*; +use crate::datatypes::*; +use crate::error::{ArrowError, Result}; + +use TimeUnit::*; + +/// Concatenate multiple `ArrayRef` with the same type. +/// +/// Returns a new ArrayRef. +pub fn concat(array_list: &Vec<ArrayRef>) -> Result<ArrayRef> { + let mut data_type: Option<DataType> = None; + let array_data_list = &array_list + .iter() + .map(|a| { + let array_data = a.data_ref().clone(); + let curr_data_type = array_data.data_type().clone(); + match &data_type { + Some(t) => { + if t != &curr_data_type { + return Err(ArrowError::ComputeError( + "Cannot concat arrays with data type".to_string(), + )); + } + } + None => { + data_type = Some(curr_data_type); + } + } + Ok(array_data) + }) + .collect::<Result<Vec<ArrayDataRef>>>()?; + + let data_type = match data_type { + None => { + return Err(ArrowError::ComputeError( + "Cannot concat 0 array".to_string(), + )); + } + Some(t) => t, + }; + match data_type { + DataType::Utf8 => concat_raw_string(array_data_list), + DataType::Boolean => concat_primitive::<BooleanType>(array_data_list), + DataType::Int8 => concat_raw_primitive::<Int8Type>(array_data_list), + DataType::Int16 => concat_raw_primitive::<Int16Type>(array_data_list), + DataType::Int32 => concat_raw_primitive::<Int32Type>(array_data_list), + DataType::Int64 => concat_raw_primitive::<Int64Type>(array_data_list), + DataType::UInt8 => concat_raw_primitive::<UInt8Type>(array_data_list), + DataType::UInt16 => concat_raw_primitive::<UInt16Type>(array_data_list), + DataType::UInt32 => concat_raw_primitive::<UInt32Type>(array_data_list), + DataType::UInt64 => concat_raw_primitive::<UInt64Type>(array_data_list), + DataType::Float32 => concat_raw_primitive::<Float32Type>(array_data_list), + DataType::Float64 => concat_raw_primitive::<Float64Type>(array_data_list), + DataType::Date32(_) => concat_raw_primitive::<Date32Type>(array_data_list), + DataType::Date64(_) => concat_raw_primitive::<Date64Type>(array_data_list), + DataType::Time32(Second) => { + concat_raw_primitive::<Time32SecondType>(array_data_list) + } + DataType::Time32(Millisecond) => { + concat_raw_primitive::<Time32MillisecondType>(array_data_list) + } + DataType::Time64(Microsecond) => { + concat_raw_primitive::<Time64MicrosecondType>(array_data_list) + } + DataType::Time64(Nanosecond) => { + concat_raw_primitive::<Time64NanosecondType>(array_data_list) + } + DataType::Timestamp(Second, _) => { + concat_raw_primitive::<TimestampSecondType>(array_data_list) + } + DataType::Timestamp(Millisecond, _) => { + concat_raw_primitive::<TimestampMillisecondType>(array_data_list) + } + DataType::Timestamp(Microsecond, _) => { + concat_raw_primitive::<TimestampMicrosecondType>(array_data_list) + } + DataType::Timestamp(Nanosecond, _) => { + concat_raw_primitive::<TimestampNanosecondType>(array_data_list) + } + DataType::Interval(IntervalUnit::YearMonth) => { + concat_raw_primitive::<IntervalYearMonthType>(array_data_list) + } + DataType::Interval(IntervalUnit::DayTime) => { + concat_raw_primitive::<IntervalDayTimeType>(array_data_list) + } + DataType::Duration(TimeUnit::Second) => { + concat_raw_primitive::<DurationSecondType>(array_data_list) + } + DataType::Duration(TimeUnit::Millisecond) => { + concat_raw_primitive::<DurationMillisecondType>(array_data_list) + } + DataType::Duration(TimeUnit::Microsecond) => { + concat_raw_primitive::<DurationMicrosecondType>(array_data_list) + } + DataType::Duration(TimeUnit::Nanosecond) => { + concat_raw_primitive::<DurationNanosecondType>(array_data_list) + } + t => unimplemented!("Concat not supported for data type {:?}", t), + } +} + +fn concat_primitive<T>(array_data_list: &Vec<ArrayDataRef>) -> Result<ArrayRef> +where + T: ArrowPrimitiveType, +{ + let rows_count = array_data_list.iter().map(|a| a.len()).sum::<usize>(); + let mut builder = PrimitiveBuilder::<T>::new(rows_count); + + for array_data in array_data_list { + let a = PrimitiveArray::<T>::from(array_data.clone()); + for i in 0..a.len() { + if a.is_valid(i) { + builder.append_value(a.value(i))?; + } else { + builder.append_null()?; + } + } + } + + Ok(Arc::new(builder.finish()) as ArrayRef) +} + +// for better performance, we manually concat primitive value buffers instead of using +// PrimitiveBuilder +fn concat_raw_primitive<T>(array_data_list: &Vec<ArrayDataRef>) -> Result<ArrayRef> +where + T: ArrowPrimitiveType, +{ + let value_count = array_data_list.iter().map(|a| a.len()).sum::<usize>(); + let mut null_count = 0; + let mut values_builder = BufferBuilder::<T>::new(value_count); + let mut null_bit_builder = BooleanBufferBuilder::new(value_count); + + for array_data in array_data_list { + null_count += array_data.null_count(); + let value_buffer = &array_data.buffers()[0]; + values_builder.write_bytes(value_buffer.data(), value_buffer.len())?; + for i in 0..array_data.len() { + null_bit_builder.append(array_data.is_valid(i))?; + } + } + + Ok(Arc::new(PrimitiveArray::<T>::from( + ArrayData::builder(T::get_data_type()) + .len(value_count) + .add_buffer(values_builder.finish()) + .null_count(null_count) + .null_bit_buffer(null_bit_builder.finish()) + .build(), + ))) +} + +// for better performance, we manually concat string value buffers instead of using StringBuilder +fn concat_raw_string(array_data_list: &Vec<ArrayDataRef>) -> Result<ArrayRef> { Review comment: great work on #7365, looking forward to refactor/simplify this PR after it's merged! ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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