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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,154 @@ | ||
| // 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 std::{fmt::Debug, sync::Arc}; | ||
|
|
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| use anyhow::Context; | ||
| use arrow::{ | ||
| array::{BinaryArray, RecordBatch}, | ||
| buffer::OffsetBuffer, | ||
| }; | ||
| use arrow_schema::DataType; | ||
| use macros::ensure; | ||
|
|
||
| use crate::Result; | ||
|
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| pub trait MergeOperator: Send + Sync + Debug { | ||
| fn merge(&self, _batch: &RecordBatch) -> Result<RecordBatch>; | ||
| } | ||
|
|
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| #[derive(Debug)] | ||
| pub struct LastValueOperator; | ||
|
|
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| impl MergeOperator for LastValueOperator { | ||
| fn merge(&self, batch: &RecordBatch) -> Result<RecordBatch> { | ||
| let last_row = batch.slice(batch.num_rows() - 1, 1); | ||
| Ok(last_row) | ||
| } | ||
| } | ||
|
|
||
| #[derive(Debug)] | ||
| pub struct BytesMergeOperator { | ||
| /// Column index of the column need to append together | ||
| /// The column type must be `Binary`. | ||
| value_idxes: Vec<usize>, | ||
| } | ||
|
|
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| impl BytesMergeOperator { | ||
| pub fn new(value_idxes: Vec<usize>) -> Self { | ||
| Self { value_idxes } | ||
| } | ||
| } | ||
|
|
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| impl MergeOperator for BytesMergeOperator { | ||
| fn merge(&self, batch: &RecordBatch) -> Result<RecordBatch> { | ||
| assert!(batch.num_rows() > 0); | ||
|
|
||
| for idx in &self.value_idxes { | ||
| let data_type = batch.column(*idx).data_type(); | ||
| ensure!( | ||
| data_type == &DataType::Binary, | ||
| "MergeOperator is only used for binary column, current:{data_type}" | ||
| ); | ||
| } | ||
|
|
||
| let columns = batch | ||
| .columns() | ||
| .iter() | ||
| .enumerate() | ||
| .map(|(idx, column)| { | ||
| if self.value_idxes.contains(&idx) { | ||
| // For value column, we append all elements | ||
| let binary_array = column.as_any().downcast_ref::<BinaryArray>().unwrap(); | ||
| // bytes buffer is cheap for clone. | ||
| let byte_buffer = binary_array.values().clone(); | ||
| let offsets = OffsetBuffer::from_lengths([byte_buffer.len()]); | ||
| let concated_column = BinaryArray::new(offsets, byte_buffer, None); | ||
| Arc::new(concated_column) | ||
| } else { | ||
| // For other columns, we just take the first element since the primary key | ||
| // columns are the same. | ||
| column.slice(0, 1) | ||
| } | ||
| }) | ||
| .collect(); | ||
|
|
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| let merged_batch = RecordBatch::try_new(batch.schema(), columns) | ||
| .context("failed to construct RecordBatch in BytesMergeOperator.")?; | ||
|
|
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| Ok(merged_batch) | ||
| } | ||
| } | ||
|
|
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| #[cfg(test)] | ||
| mod tests { | ||
| use arrow::array::{self as arrow_array}; | ||
| use datafusion::common::{create_array, record_batch}; | ||
|
|
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| use super::*; | ||
| use crate::arrow_schema; | ||
|
|
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| #[test] | ||
| fn test_last_value_operator() { | ||
| let operator = LastValueOperator; | ||
| let batch = record_batch!( | ||
| ("pk1", UInt8, vec![11, 11, 11, 11]), | ||
| ("pk2", UInt8, vec![100, 100, 100, 100]), | ||
| ("value", Int64, vec![2, 7, 4, 1]) | ||
| ) | ||
| .unwrap(); | ||
|
|
||
| let actual = operator.merge(&batch).unwrap(); | ||
| let expected = record_batch!( | ||
| ("pk1", UInt8, vec![11]), | ||
| ("pk2", UInt8, vec![100]), | ||
| ("value", Int64, vec![1]) | ||
| ) | ||
| .unwrap(); | ||
| assert_eq!(actual, expected); | ||
| } | ||
|
|
||
| #[test] | ||
| fn test_bytes_merge_operator() { | ||
| let operator = BytesMergeOperator::new(vec![2]); | ||
| let schema = arrow_schema!(("pk1", UInt8), ("pk2", UInt8), ("value", Binary)); | ||
|
|
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| let batch = RecordBatch::try_new( | ||
| schema.clone(), | ||
| vec![ | ||
| create_array!(UInt8, vec![11, 11, 11, 11]), | ||
| create_array!(UInt8, vec![100, 100, 100, 100]), | ||
| Arc::new(BinaryArray::from_vec(vec![ | ||
| b"one", b"two", b"three", b"four", | ||
| ])), | ||
| ], | ||
| ) | ||
| .unwrap(); | ||
|
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| let actual = operator.merge(&batch).unwrap(); | ||
| let expected = RecordBatch::try_new( | ||
| schema.clone(), | ||
| vec![ | ||
| create_array!(UInt8, vec![11]), | ||
| create_array!(UInt8, vec![100]), | ||
| Arc::new(BinaryArray::from_vec(vec![b"onetwothreefour"])), | ||
| ], | ||
| ) | ||
| .unwrap(); | ||
| assert_eq!(actual, expected); | ||
| } | ||
| } |
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