viirya commented on code in PR #3553:
URL: https://github.com/apache/arrow-rs/pull/3553#discussion_r1086317133
##########
arrow-data/src/data.rs:
##########
@@ -1446,6 +1493,50 @@ impl ArrayData {
})
}
+ /// Validates that each value in run_ends array is positive and strictly
increasing.
+ fn check_run_ends<T>(&self, array_len: usize) -> Result<(), ArrowError>
+ where
+ T: ArrowNativeType + TryInto<i64> + num::Num + std::fmt::Display,
+ {
+ let values = self.typed_buffer::<T>(0, self.len())?;
+ let mut prev_value: i64 = 0_i64;
+ values.iter().enumerate().try_for_each(|(ix, &inp_value)| {
+ let value: i64 = inp_value.try_into().map_err(|_| {
+ ArrowError::InvalidArgumentError(format!(
+ "Value at position {} out of bounds: {} (can not convert
to i64)",
+ ix, inp_value
+ ))
+ })?;
+ if value <= 0_i64 {
+ return Err(ArrowError::InvalidArgumentError(format!(
+ "The values in run_ends array should be strictly positive.
Found value {} at index {} that does not match the criteria.",
+ value,
+ ix
+ )));
+ }
+ if ix > 0 && value <= prev_value {
+ return Err(ArrowError::InvalidArgumentError(format!(
+ "The values in run_ends array should be strictly
increasing. Found value {} at index {} with previous value {} that does not
match the criteria.",
+ value,
+ ix,
+ prev_value
+ )));
+ }
+
+ prev_value = value;
+ Ok(())
+ })?;
+
+ if prev_value.as_usize() != array_len {
Review Comment:
`array_len` is run-ends array's length or RunArray's logical length? I saw
it is called with `self.len()` so looks like run-ends array's length? But I
think here it should be RunArray's logical length?
##########
arrow-array/src/builder/primitive_run_builder.rs:
##########
@@ -0,0 +1,293 @@
+// 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::{any::Any, sync::Arc};
+
+use crate::{types::RunEndIndexType, ArrayRef, ArrowPrimitiveType, RunArray};
+
+use super::{ArrayBuilder, PrimitiveBuilder};
+
+use arrow_buffer::ArrowNativeType;
+
+/// Array builder for [`RunArray`] that encodes primitive values.
+///
+/// # Example:
+///
+/// ```
+///
+/// # use arrow_array::builder::PrimitiveRunBuilder;
+/// # use arrow_array::cast::as_primitive_array;
+/// # use arrow_array::types::{UInt32Type, Int16Type};
+/// # use arrow_array::{Array, UInt32Array, Int16Array};
+///
+/// let mut builder =
+/// PrimitiveRunBuilder::<Int16Type, UInt32Type>::new();
+/// builder.append_value(1234);
+/// builder.append_value(1234);
+/// builder.append_value(1234);
+/// builder.append_null();
+/// builder.append_value(5678);
+/// builder.append_value(5678);
+/// let array = builder.finish();
+///
+/// assert_eq!(
+/// array.run_ends(),
+/// &Int16Array::from(vec![Some(3), Some(4), Some(6)])
+/// );
+///
+/// let av = array.values();
+///
+/// assert!(!av.is_null(0));
+/// assert!(av.is_null(1));
+/// assert!(!av.is_null(2));
+///
+/// // Values are polymorphic and so require a downcast.
+/// let ava: &UInt32Array = as_primitive_array::<UInt32Type>(av.as_ref());
+///
+/// assert_eq!(ava, &UInt32Array::from(vec![Some(1234), None, Some(5678)]));
+/// ```
+#[derive(Debug)]
+pub struct PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ run_ends_builder: PrimitiveBuilder<R>,
+ values_builder: PrimitiveBuilder<V>,
+ current_value: Option<V::Native>,
+ current_run_end_index: usize,
+ prev_run_end_index: usize,
+}
+
+impl<R, V> Default for PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl<R, V> PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Creates a new `PrimitiveRunBuilder`
+ pub fn new() -> Self {
+ Self {
+ run_ends_builder: PrimitiveBuilder::new(),
+ values_builder: PrimitiveBuilder::new(),
+ current_value: None,
+ current_run_end_index: 0,
+ prev_run_end_index: 0,
+ }
+ }
+
+ /// Creates a new `PrimitiveRunBuilder` with the provided capacity
+ ///
+ /// `capacity`: the expected number of run-end encoded values.
+ pub fn with_capacity(capacity: usize) -> Self {
+ Self {
+ run_ends_builder: PrimitiveBuilder::with_capacity(capacity),
+ values_builder: PrimitiveBuilder::with_capacity(capacity),
+ current_value: None,
+ current_run_end_index: 0,
+ prev_run_end_index: 0,
+ }
+ }
+}
+
+impl<R, V> ArrayBuilder for PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Returns the builder as a non-mutable `Any` reference.
+ fn as_any(&self) -> &dyn Any {
+ self
+ }
+
+ /// Returns the builder as a mutable `Any` reference.
+ fn as_any_mut(&mut self) -> &mut dyn Any {
+ self
+ }
+
+ /// Returns the boxed builder as a box of `Any`.
+ fn into_box_any(self: Box<Self>) -> Box<dyn Any> {
+ self
+ }
+
+ /// Returns the length of logical array encoded by
+ /// the eventual runs array.
+ fn len(&self) -> usize {
+ self.current_run_end_index
+ }
+
+ /// Returns whether the number of array slots is zero
+ fn is_empty(&self) -> bool {
+ self.current_run_end_index == 0
+ }
+
+ /// Builds the array and reset this builder.
+ fn finish(&mut self) -> ArrayRef {
+ Arc::new(self.finish())
+ }
+
+ /// Builds the array without resetting the builder.
+ fn finish_cloned(&self) -> ArrayRef {
+ Arc::new(self.finish_cloned())
+ }
+}
+
+impl<R, V> PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Appends optional value to the logical array encoded by the RunArray.
+ pub fn append_option(&mut self, value: Option<V::Native>) {
+ if self.current_run_end_index == 0 {
+ self.current_run_end_index = 1;
+ self.current_value = value;
+ return;
+ }
+ if self.current_value != value {
+ self.append_run_end();
+ self.current_value = value;
+ }
+
+ self.current_run_end_index += 1;
+ }
+
+ /// Appends value to the logical array encoded by the run-ends array.
+ pub fn append_value(&mut self, value: V::Native) {
+ self.append_option(Some(value))
+ }
+
+ /// Appends null to the logical array encoded by the run-ends array.
+ pub fn append_null(&mut self) {
+ self.append_option(None)
+ }
+
+ /// Creates the RunArray and resets the builder.
+ /// Panics if RunArray cannot be built.
+ pub fn finish(&mut self) -> RunArray<R> {
+ // write the last run end to the array.
+ self.append_run_end();
+
+ // reset the run index to zero.
+ self.current_value = None;
+ self.current_run_end_index = 0;
+
+ // build the run encoded array by adding run_ends and values array as
its children.
+ let run_ends_array = self.run_ends_builder.finish();
+ let values_array = self.values_builder.finish();
+ RunArray::<R>::try_new(&run_ends_array, &values_array).unwrap()
+ }
+
+ /// Creates the RunArray and without resetting the builder.
+ /// Panics if RunArray cannot be built.
+ pub fn finish_cloned(&self) -> RunArray<R> {
+ let mut run_ends_array = self.run_ends_builder.finish_cloned();
+ let mut values_array = self.values_builder.finish_cloned();
+
+ // Add current run if one exists
+ if self.prev_run_end_index != self.current_run_end_index {
+ let mut run_end_builder = run_ends_array.into_builder().unwrap();
+ let mut values_builder = values_array.into_builder().unwrap();
+ self.append_run_end_with_builders(&mut run_end_builder, &mut
values_builder);
+ run_ends_array = run_end_builder.finish();
+ values_array = values_builder.finish();
+ }
+
+ RunArray::try_new(&run_ends_array, &values_array).unwrap()
+ }
+
+ // Appends the current run to the array.
+ fn append_run_end(&mut self) {
+ // empty array or the function called without appending any value.
+ if self.prev_run_end_index == self.current_run_end_index {
+ return;
+ }
+ let run_end_index = self.run_end_index_as_native();
+ self.run_ends_builder.append_value(run_end_index);
+ self.values_builder.append_option(self.current_value);
+ self.prev_run_end_index = self.current_run_end_index;
+ }
+
+ // Similar to `append_run_end` but on custom builders.
+ // Used in `finish_cloned` which is not suppose to mutate `self`.
+ fn append_run_end_with_builders(
+ &self,
+ run_ends_builder: &mut PrimitiveBuilder<R>,
+ values_builder: &mut PrimitiveBuilder<V>,
+ ) {
+ let run_end_index = self.run_end_index_as_native();
+ run_ends_builder.append_value(run_end_index);
+ values_builder.append_option(self.current_value);
+ }
+
+ fn run_end_index_as_native(&self) -> R::Native {
+ R::Native::from_usize(self.current_run_end_index)
+ .unwrap_or_else(|| panic!(
+ "Cannot convert the value {} from `usize` to native form of
arrow datatype {}",
+ self.current_run_end_index,
+ R::DATA_TYPE
+ ))
+ }
+}
+
+#[cfg(test)]
+mod tests {
+ use crate::builder::PrimitiveRunBuilder;
+ use crate::cast::as_primitive_array;
+ use crate::types::{Int16Type, UInt32Type};
+ use crate::{Array, Int16Array, UInt32Array};
+ #[test]
Review Comment:
```suggestion
use crate::{Array, Int16Array, UInt32Array};
#[test]
```
##########
arrow-array/src/array/run_array.rs:
##########
@@ -0,0 +1,506 @@
+// 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::any::Any;
+
+use arrow_buffer::ArrowNativeType;
+use arrow_data::{ArrayData, ArrayDataBuilder};
+use arrow_schema::{ArrowError, DataType, Field};
+
+use crate::{
+ builder::StringRunBuilder,
+ make_array,
+ types::{Int16Type, Int32Type, Int64Type, RunEndIndexType},
+ Array, ArrayRef, PrimitiveArray,
+};
+
+///
+/// A run-end encoding (REE) is a variation of [run-length encoding
(RLE)](https://en.wikipedia.org/wiki/Run-length_encoding).
+///
+/// This encoding is good for representing data containing same values
repeated consecutively.
+///
+/// [`RunArray`] contains `run_ends` array and `values` array of same length.
+/// The `run_ends` array stores the indexes at which the run ends. The
`values` array
+/// stores the value of each run. Below example illustrates how a logical
array is represented in
+/// [`RunArray`]
+///
+///
+/// ```text
+/// ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─┐
+/// ┌─────────────────┐ ┌─────────┐ ┌─────────────────┐
+/// │ │ A │ │ 2 │ │ │ A │
+/// ├─────────────────┤ ├─────────┤ ├─────────────────┤
+/// │ │ D │ │ 3 │ │ │ A │ run length
of 'A' = runs_ends[0] - 0 = 2
+/// ├─────────────────┤ ├─────────┤ ├─────────────────┤
+/// │ │ B │ │ 6 │ │ │ D │ run length
of 'D' = run_ends[1] - run_ends[0] = 1
+/// └─────────────────┘ └─────────┘ ├─────────────────┤
+/// │ values run_ends │ │ B │
+/// ├─────────────────┤
+/// └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─┘ │ B │
+/// ├─────────────────┤
+/// RunArray │ B │ run length
of 'B' = run_ends[2] - run_ends[1] = 3
+/// length = 3 └─────────────────┘
+///
+/// Logical array
+/// Contents
+/// ```
+
+pub struct RunArray<R: RunEndIndexType> {
+ data: ArrayData,
+ run_ends: PrimitiveArray<R>,
+ values: ArrayRef,
+}
+
+impl<R: RunEndIndexType> RunArray<R> {
+ // calculates the logical length of the array encoded
+ // by the given run_ends array.
+ fn logical_len(run_ends: &PrimitiveArray<R>) -> usize {
+ let len = run_ends.len();
+ if len == 0 {
+ return 0;
+ }
+ run_ends.value(len - 1).as_usize()
+ }
+
+ /// Attempts to create RunArray using given run_ends (index where a run
ends)
+ /// and the values (value of the run). Returns an error if the given data
is not compatible
+ /// with RunEndEncoded specification.
+ pub fn try_new(
+ run_ends: &PrimitiveArray<R>,
+ values: &dyn Array,
+ ) -> Result<Self, ArrowError> {
+ let run_ends_type = run_ends.data_type().clone();
+ let values_type = values.data_type().clone();
+ let ree_array_type = DataType::RunEndEncoded(
+ Box::new(Field::new("run_ends", run_ends_type, false)),
+ Box::new(Field::new("values", values_type, true)),
+ );
+ let len = RunArray::logical_len(run_ends);
+ let builder = ArrayDataBuilder::new(ree_array_type)
+ .len(len)
+ .add_child_data(run_ends.data().clone())
+ .add_child_data(values.data().clone());
+
+ // `build_unchecked` is used to avoid recursive validation of child
arrays.
+ let array_data = unsafe { builder.build_unchecked() };
+
+ // Safety: `validate_data` checks below
+ // 1. The given array data has exactly two child arrays.
+ // 2. The first child array (run_ends) has valid data type.
+ // 3. run_ends array does not have null values
+ // 4. run_ends array has non-zero and strictly increasing values.
+ // 5. The length of run_ends array and values array are the same.
+ array_data.validate_data()?;
+
+ Ok(array_data.into())
+ }
+ /// Returns a reference to run_ends array
Review Comment:
```suggestion
}
/// Returns a reference to run_ends array
```
##########
arrow-array/src/builder/primitive_run_builder.rs:
##########
@@ -0,0 +1,293 @@
+// 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::{any::Any, sync::Arc};
+
+use crate::{types::RunEndIndexType, ArrayRef, ArrowPrimitiveType, RunArray};
+
+use super::{ArrayBuilder, PrimitiveBuilder};
+
+use arrow_buffer::ArrowNativeType;
+
+/// Array builder for [`RunArray`] that encodes primitive values.
+///
+/// # Example:
+///
+/// ```
+///
+/// # use arrow_array::builder::PrimitiveRunBuilder;
+/// # use arrow_array::cast::as_primitive_array;
+/// # use arrow_array::types::{UInt32Type, Int16Type};
+/// # use arrow_array::{Array, UInt32Array, Int16Array};
+///
+/// let mut builder =
+/// PrimitiveRunBuilder::<Int16Type, UInt32Type>::new();
+/// builder.append_value(1234);
+/// builder.append_value(1234);
+/// builder.append_value(1234);
+/// builder.append_null();
+/// builder.append_value(5678);
+/// builder.append_value(5678);
+/// let array = builder.finish();
+///
+/// assert_eq!(
+/// array.run_ends(),
+/// &Int16Array::from(vec![Some(3), Some(4), Some(6)])
+/// );
+///
+/// let av = array.values();
+///
+/// assert!(!av.is_null(0));
+/// assert!(av.is_null(1));
+/// assert!(!av.is_null(2));
+///
+/// // Values are polymorphic and so require a downcast.
+/// let ava: &UInt32Array = as_primitive_array::<UInt32Type>(av.as_ref());
+///
+/// assert_eq!(ava, &UInt32Array::from(vec![Some(1234), None, Some(5678)]));
+/// ```
+#[derive(Debug)]
+pub struct PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ run_ends_builder: PrimitiveBuilder<R>,
+ values_builder: PrimitiveBuilder<V>,
+ current_value: Option<V::Native>,
+ current_run_end_index: usize,
+ prev_run_end_index: usize,
+}
+
+impl<R, V> Default for PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ fn default() -> Self {
+ Self::new()
+ }
+}
+
+impl<R, V> PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Creates a new `PrimitiveRunBuilder`
+ pub fn new() -> Self {
+ Self {
+ run_ends_builder: PrimitiveBuilder::new(),
+ values_builder: PrimitiveBuilder::new(),
+ current_value: None,
+ current_run_end_index: 0,
+ prev_run_end_index: 0,
+ }
+ }
+
+ /// Creates a new `PrimitiveRunBuilder` with the provided capacity
+ ///
+ /// `capacity`: the expected number of run-end encoded values.
+ pub fn with_capacity(capacity: usize) -> Self {
+ Self {
+ run_ends_builder: PrimitiveBuilder::with_capacity(capacity),
+ values_builder: PrimitiveBuilder::with_capacity(capacity),
+ current_value: None,
+ current_run_end_index: 0,
+ prev_run_end_index: 0,
+ }
+ }
+}
+
+impl<R, V> ArrayBuilder for PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Returns the builder as a non-mutable `Any` reference.
+ fn as_any(&self) -> &dyn Any {
+ self
+ }
+
+ /// Returns the builder as a mutable `Any` reference.
+ fn as_any_mut(&mut self) -> &mut dyn Any {
+ self
+ }
+
+ /// Returns the boxed builder as a box of `Any`.
+ fn into_box_any(self: Box<Self>) -> Box<dyn Any> {
+ self
+ }
+
+ /// Returns the length of logical array encoded by
+ /// the eventual runs array.
+ fn len(&self) -> usize {
+ self.current_run_end_index
+ }
+
+ /// Returns whether the number of array slots is zero
+ fn is_empty(&self) -> bool {
+ self.current_run_end_index == 0
+ }
+
+ /// Builds the array and reset this builder.
+ fn finish(&mut self) -> ArrayRef {
+ Arc::new(self.finish())
+ }
+
+ /// Builds the array without resetting the builder.
+ fn finish_cloned(&self) -> ArrayRef {
+ Arc::new(self.finish_cloned())
+ }
+}
+
+impl<R, V> PrimitiveRunBuilder<R, V>
+where
+ R: RunEndIndexType,
+ V: ArrowPrimitiveType,
+{
+ /// Appends optional value to the logical array encoded by the RunArray.
+ pub fn append_option(&mut self, value: Option<V::Native>) {
+ if self.current_run_end_index == 0 {
+ self.current_run_end_index = 1;
+ self.current_value = value;
+ return;
+ }
+ if self.current_value != value {
+ self.append_run_end();
+ self.current_value = value;
+ }
+
+ self.current_run_end_index += 1;
+ }
+
+ /// Appends value to the logical array encoded by the run-ends array.
+ pub fn append_value(&mut self, value: V::Native) {
+ self.append_option(Some(value))
+ }
+
+ /// Appends null to the logical array encoded by the run-ends array.
+ pub fn append_null(&mut self) {
+ self.append_option(None)
+ }
+
+ /// Creates the RunArray and resets the builder.
+ /// Panics if RunArray cannot be built.
+ pub fn finish(&mut self) -> RunArray<R> {
+ // write the last run end to the array.
+ self.append_run_end();
+
+ // reset the run index to zero.
+ self.current_value = None;
+ self.current_run_end_index = 0;
+
+ // build the run encoded array by adding run_ends and values array as
its children.
+ let run_ends_array = self.run_ends_builder.finish();
+ let values_array = self.values_builder.finish();
+ RunArray::<R>::try_new(&run_ends_array, &values_array).unwrap()
+ }
+
+ /// Creates the RunArray and without resetting the builder.
+ /// Panics if RunArray cannot be built.
+ pub fn finish_cloned(&self) -> RunArray<R> {
+ let mut run_ends_array = self.run_ends_builder.finish_cloned();
+ let mut values_array = self.values_builder.finish_cloned();
+
+ // Add current run if one exists
+ if self.prev_run_end_index != self.current_run_end_index {
+ let mut run_end_builder = run_ends_array.into_builder().unwrap();
+ let mut values_builder = values_array.into_builder().unwrap();
+ self.append_run_end_with_builders(&mut run_end_builder, &mut
values_builder);
+ run_ends_array = run_end_builder.finish();
+ values_array = values_builder.finish();
+ }
+
+ RunArray::try_new(&run_ends_array, &values_array).unwrap()
+ }
+
+ // Appends the current run to the array.
+ fn append_run_end(&mut self) {
+ // empty array or the function called without appending any value.
+ if self.prev_run_end_index == self.current_run_end_index {
+ return;
+ }
+ let run_end_index = self.run_end_index_as_native();
+ self.run_ends_builder.append_value(run_end_index);
+ self.values_builder.append_option(self.current_value);
+ self.prev_run_end_index = self.current_run_end_index;
+ }
+
+ // Similar to `append_run_end` but on custom builders.
+ // Used in `finish_cloned` which is not suppose to mutate `self`.
+ fn append_run_end_with_builders(
+ &self,
+ run_ends_builder: &mut PrimitiveBuilder<R>,
+ values_builder: &mut PrimitiveBuilder<V>,
+ ) {
+ let run_end_index = self.run_end_index_as_native();
+ run_ends_builder.append_value(run_end_index);
+ values_builder.append_option(self.current_value);
+ }
+
+ fn run_end_index_as_native(&self) -> R::Native {
+ R::Native::from_usize(self.current_run_end_index)
+ .unwrap_or_else(|| panic!(
+ "Cannot convert the value {} from `usize` to native form of
arrow datatype {}",
Review Comment:
```suggestion
"Cannot convert current run end index {} from `usize` to
native form of arrow datatype {}",
```
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