Add ArrayDataLayout (apache#1799)

arrow-buffer/src/buffer/boolean.rs

@@ -139,4 +139,9 @@ impl BooleanBuffer {
     pub fn inner(&self) -> &Buffer {
         &self.buffer
     }
+
+    /// Returns the inner [`Buffer`]
+    pub fn into_inner(self) -> Buffer {
+        self.buffer
+    }
 }

arrow-buffer/src/buffer/offset.rs

@@ -39,6 +39,21 @@ impl<O: ArrowNativeType> OffsetBuffer<O> {
         let buffer = MutableBuffer::from_len_zeroed(std::mem::size_of::<O>());
         Self(buffer.into_buffer().into())
     }
+
+    /// Returns the inner [`ScalarBuffer`]
+    pub fn inner(&self) -> &ScalarBuffer<O> {
+        &self.0
+    }
+
+    /// Returns the inner [`Buffer`]
+    pub fn into_inner(self) -> ScalarBuffer<O> {
+        self.0
+    }
+
+    /// Returns a zero-copy slice of this buffer with length `len` and starting at `offset`
+    pub fn slice(&self, offset: usize, len: usize) -> Self {
+        Self(self.0.slice(offset, len.saturating_add(1)))
+    }
 }
 
 impl<T: ArrowNativeType> Deref for OffsetBuffer<T> {

arrow-buffer/src/buffer/run.rs

@@ -157,4 +157,14 @@ where
             len,
         }
     }
+
+    /// Returns the inner [`ScalarBuffer`]
+    pub fn inner(&self) -> &ScalarBuffer<E> {
+        &self.run_ends
+    }
+
+    /// Returns the inner [`ScalarBuffer`]
+    pub fn into_inner(self) -> ScalarBuffer<E> {
+        self.run_ends
+    }
 }

arrow-buffer/src/buffer/scalar.rs

@@ -50,6 +50,21 @@ impl<T: ArrowNativeType> ScalarBuffer<T> {
         let byte_len = len.checked_mul(size).expect("length overflow");
         buffer.slice_with_length(byte_offset, byte_len).into()
     }
+
+    /// Returns a zero-copy slice of this buffer with length `len` and starting at `offset`
+    pub fn slice(&self, offset: usize, len: usize) -> Self {
+        Self::new(self.buffer.clone(), offset, len)
+    }
+
+    /// Returns the inner [`Buffer`]
+    pub fn inner(&self) -> &Buffer {
+        &self.buffer
+    }
+
+    /// Returns the inner [`Buffer`]
+    pub fn into_inner(self) -> Buffer {
+        self.buffer
+    }
 }
 
 impl<T: ArrowNativeType> Deref for ScalarBuffer<T> {

arrow-data/src/data/boolean.rs

@@ -0,0 +1,139 @@
+// 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::data::types::PhysicalType;
+use crate::data::ArrayDataLayout;
+use crate::{ArrayDataBuilder, Buffers};
+use arrow_buffer::buffer::{BooleanBuffer, NullBuffer};
+use arrow_schema::DataType;
+
+#[derive(Debug, Clone)]
+pub struct BooleanArrayData {
+    data_type: DataType,
+    values: BooleanBuffer,
+    nulls: Option<NullBuffer>,
+}
+
+impl BooleanArrayData {
+    /// Create a new [`BooleanArrayData`]
+    ///
+    /// # Panics
+    ///
+    /// Panics if
+    /// - `nulls` and `values` are different lengths
+    /// - `data_type` is not compatible with `T`
+    pub fn new(
+        data_type: DataType,
+        values: BooleanBuffer,
+        nulls: Option<NullBuffer>,
+    ) -> Self {
+        let physical = PhysicalType::from(&data_type);
+        assert_eq!(
+            physical, PhysicalType::Boolean,
+            "Illegal physical type for BooleanArrayData of datatype {:?}, expected {:?} got {:?}",
+            data_type,
+            PhysicalType::Boolean,
+            physical
+        );
+
+        if let Some(n) = nulls.as_ref() {
+            assert_eq!(values.len(), n.len())
+        }
+        Self {
+            data_type,
+            values,
+            nulls,
+        }
+    }
+
+    /// Create a new [`BooleanArrayData`]
+    ///
+    /// # Safety
+    ///
+    /// - `nulls` and `values` are the same lengths
+    /// - `PhysicalType::from(&data_type) == PhysicalType::Boolean`
+    pub unsafe fn new_unchecked(
+        data_type: DataType,
+        values: BooleanBuffer,
+        nulls: Option<NullBuffer>,
+    ) -> Self {
+        Self {
+            data_type,
+            values,
+            nulls,
+        }
+    }
+
+    /// Creates a new [`BooleanArrayData`] from raw buffers
+    ///
+    /// # Safety
+    ///
+    /// See [`BooleanArrayData::new_unchecked`]
+    pub(crate) unsafe fn from_raw(builder: ArrayDataBuilder) -> Self {
+        let values = builder.buffers.into_iter().next().unwrap();
+        let values = BooleanBuffer::new(values, builder.offset, builder.len);
+        Self {
+            values,
+            data_type: builder.data_type,
+            nulls: builder.nulls,
+        }
+    }
+
+    /// Returns the null buffer if any
+    #[inline]
+    pub fn nulls(&self) -> Option<&NullBuffer> {
+        self.nulls.as_ref()
+    }
+
+    /// Returns the boolean values
+    #[inline]
+    pub fn values(&self) -> &BooleanBuffer {
+        &self.values
+    }
+
+    /// Returns the data type of this array
+    #[inline]
+    pub fn data_type(&self) -> &DataType {
+        &self.data_type
+    }
+
+    /// Returns the underlying parts of this [`BooleanArrayData`]
+    pub fn into_parts(self) -> (DataType, BooleanBuffer, Option<NullBuffer>) {
+        (self.data_type, self.values, self.nulls)
+    }
+
+    /// Returns a zero-copy slice of this array
+    pub fn slice(&self, offset: usize, len: usize) -> Self {
+        Self {
+            data_type: self.data_type.clone(),
+            values: self.values.slice(offset, len),
+            nulls: self.nulls.as_ref().map(|x| x.slice(offset, len)),
+        }
+    }
+
+    /// Returns an [`ArrayDataLayout`] representation of this
+    pub(crate) fn layout(&self) -> ArrayDataLayout<'_> {
+        ArrayDataLayout {
+            data_type: &self.data_type,
+            len: self.values.len(),
+            offset: self.values.offset(),
+            nulls: self.nulls.as_ref(),
+            buffers: Buffers::one(self.values().inner()),
+            child_data: &[],
+        }
+    }
+}

arrow-data/src/data/buffers.rs

@@ -25,7 +25,6 @@ pub struct Buffers<'a>([Option<&'a Buffer>; 2]);
 
 impl<'a> Buffers<'a> {
     /// Temporary will be removed once ArrayData does not store `Vec<Buffer>` directly (#3769)
-    #[inline]
     pub(crate) fn from_slice(a: &'a [Buffer]) -> Self {
         match a.len() {
             0 => Self([None, None]),
@@ -34,6 +33,16 @@ impl<'a> Buffers<'a> {
         }
     }
 
+    #[inline]
+    pub(crate) fn one(b: &'a Buffer) -> Self {
+        Self([Some(b), None])
+    }
+
+    #[inline]
+    pub(crate) fn two(a: &'a Buffer, b: &'a Buffer) -> Self {
+        Self([Some(a), Some(b)])
+    }
+
     /// Returns the number of [`Buffer`] in this collection
     #[inline]
     pub fn len(&self) -> usize {