Avoid concat for array_replace (#8337)

* add benchmark

Signed-off-by: jayzhan211 <[email protected]>

* fmt

Signed-off-by: jayzhan211 <[email protected]>

* address clippy

Signed-off-by: jayzhan211 <[email protected]>

* cleanup

Signed-off-by: jayzhan211 <[email protected]>

* fix comment

Signed-off-by: jayzhan211 <[email protected]>

---------

Signed-off-by: jayzhan211 <[email protected]>
Co-authored-by: Andrew Lamb <[email protected]>

Author: jayzhan211

datafusion/core/Cargo.toml

@@ -167,3 +167,7 @@ name = "sort"
 [[bench]]
 harness = false
 name = "topk_aggregate"
+
+[[bench]]
+harness = false
+name = "array_expression"

datafusion/core/benches/array_expression.rs

@@ -0,0 +1,73 @@
+// 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.
+
+#[macro_use]
+extern crate criterion;
+extern crate arrow;
+extern crate datafusion;
+
+mod data_utils;
+use crate::criterion::Criterion;
+use arrow_array::cast::AsArray;
+use arrow_array::types::Int64Type;
+use arrow_array::{ArrayRef, Int64Array, ListArray};
+use datafusion_physical_expr::array_expressions;
+use std::sync::Arc;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    // Construct large arrays for benchmarking
+
+    let array_len = 100000000;
+
+    let array = (0..array_len).map(|_| Some(2_i64)).collect::<Vec<_>>();
+    let list_array = ListArray::from_iter_primitive::<Int64Type, _, _>(vec![
+        Some(array.clone()),
+        Some(array.clone()),
+        Some(array),
+    ]);
+    let from_array = Int64Array::from_value(2, 3);
+    let to_array = Int64Array::from_value(-2, 3);
+
+    let args = vec![
+        Arc::new(list_array) as ArrayRef,
+        Arc::new(from_array) as ArrayRef,
+        Arc::new(to_array) as ArrayRef,
+    ];
+
+    let array = (0..array_len).map(|_| Some(-2_i64)).collect::<Vec<_>>();
+    let expected_array = ListArray::from_iter_primitive::<Int64Type, _, _>(vec![
+        Some(array.clone()),
+        Some(array.clone()),
+        Some(array),
+    ]);
+
+    // Benchmark array functions
+
+    c.bench_function("array_replace", |b| {
+        b.iter(|| {
+            assert_eq!(
+                array_expressions::array_replace_all(args.as_slice())
+                    .unwrap()
+                    .as_list::<i32>(),
+                criterion::black_box(&expected_array)
+            )
+        })
+    });
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);

datafusion/physical-expr/src/array_expressions.rs

@@ -35,8 +35,7 @@ use datafusion_common::cast::{
 };
 use datafusion_common::utils::{array_into_list_array, list_ndims};
 use datafusion_common::{
-    exec_err, internal_datafusion_err, internal_err, not_impl_err, plan_err,
-    DataFusionError, Result,
+    exec_err, internal_err, not_impl_err, plan_err, DataFusionError, Result,
 };
 
 use itertools::Itertools;
@@ -1320,84 +1319,76 @@ fn general_replace(
 ) -> Result<ArrayRef> {
     // Build up the offsets for the final output array
     let mut offsets: Vec<i32> = vec![0];
-    let data_type = list_array.value_type();
-    let mut new_values = vec![];
+    let values = list_array.values();
+    let original_data = values.to_data();
+    let to_data = to_array.to_data();
+    let capacity = Capacities::Array(original_data.len());
 
-    // n is the number of elements to replace in this row
-    for (row_index, (list_array_row, n)) in
-        list_array.iter().zip(arr_n.iter()).enumerate()
-    {
-        let last_offset: i32 = offsets
-            .last()
-            .copied()
-            .ok_or_else(|| internal_datafusion_err!("offsets should not be empty"))?;
+    // First array is the original array, second array is the element to replace with.
+    let mut mutable = MutableArrayData::with_capacities(
+        vec![&original_data, &to_data],
+        false,
+        capacity,
+    );
 
-        match list_array_row {
-            Some(list_array_row) => {
-                // Compute all positions in list_row_array (that is itself an
-                // array) that are equal to `from_array_row`
-                let eq_array = compare_element_to_list(
-                    &list_array_row,
-                    &from_array,
-                    row_index,
-                    true,
-                )?;
+    let mut valid = BooleanBufferBuilder::new(list_array.len());
 
-                // Use MutableArrayData to build the replaced array
-                let original_data = list_array_row.to_data();
-                let to_data = to_array.to_data();
-                let capacity = Capacities::Array(original_data.len() + to_data.len());
+    for (row_index, offset_window) in list_array.offsets().windows(2).enumerate() {
+        if list_array.is_null(row_index) {
+            offsets.push(offsets[row_index]);
+            valid.append(false);
+            continue;
+        }
 
-                // First array is the original array, second array is the element to replace with.
-                let mut mutable = MutableArrayData::with_capacities(
-                    vec![&original_data, &to_data],
-                    false,
-                    capacity,
-                );
-                let original_idx = 0;
-                let replace_idx = 1;
-
-                let mut counter = 0;
-                for (i, to_replace) in eq_array.iter().enumerate() {
-                    if let Some(true) = to_replace {
-                        mutable.extend(replace_idx, row_index, row_index + 1);
-                        counter += 1;
-                        if counter == *n {
-                            // copy original data for any matches past n
-                            mutable.extend(original_idx, i + 1, eq_array.len());
-                            break;
-                        }
-                    } else {
-                        // copy original data for false / null matches
-                        mutable.extend(original_idx, i, i + 1);
-                    }
-                }
+        let start = offset_window[0] as usize;
+        let end = offset_window[1] as usize;
 
-                let data = mutable.freeze();
-                let replaced_array = arrow_array::make_array(data);
+        let list_array_row = list_array.value(row_index);
 
-                offsets.push(last_offset + replaced_array.len() as i32);
-                new_values.push(replaced_array);
-            }
-            None => {
-                // Null element results in a null row (no new offsets)
-                offsets.push(last_offset);
+        // Compute all positions in list_row_array (that is itself an
+        // array) that are equal to `from_array_row`
+        let eq_array =
+            compare_element_to_list(&list_array_row, &from_array, row_index, true)?;
+
+        let original_idx = 0;
+        let replace_idx = 1;
+        let n = arr_n[row_index];
+        let mut counter = 0;
+
+        // All elements are false, no need to replace, just copy original data
+        if eq_array.false_count() == eq_array.len() {
+            mutable.extend(original_idx, start, end);
+            offsets.push(offsets[row_index] + (end - start) as i32);
+            valid.append(true);
+            continue;
+        }
+
+        for (i, to_replace) in eq_array.iter().enumerate() {
+            if let Some(true) = to_replace {
+                mutable.extend(replace_idx, row_index, row_index + 1);
+                counter += 1;
+                if counter == n {
+                    // copy original data for any matches past n
+                    mutable.extend(original_idx, start + i + 1, end);
+                    break;
+                }
+            } else {
+                // copy original data for false / null matches
+                mutable.extend(original_idx, start + i, start + i + 1);
             }
         }
+
+        offsets.push(offsets[row_index] + (end - start) as i32);
+        valid.append(true);
     }
 
-    let values = if new_values.is_empty() {
-        new_empty_array(&data_type)
-    } else {
-        let new_values: Vec<_> = new_values.iter().map(|a| a.as_ref()).collect();
-        arrow::compute::concat(&new_values)?
-    };
+    let data = mutable.freeze();
 
     Ok(Arc::new(ListArray::try_new(
-        Arc::new(Field::new("item", data_type, true)),
+        Arc::new(Field::new("item", list_array.value_type(), true)),
         OffsetBuffer::new(offsets.into()),
-        values,
-        list_array.nulls().cloned(),
+        arrow_array::make_array(data),
+        Some(NullBuffer::new(valid.finish())),
     )?))
 }