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use std::any::Any;
use std::sync::Arc;
use crate::array::ArrayBuilder;
use crate::array::ArrayData;
use crate::array::ArrayRef;
use crate::array::BooleanArray;
use crate::datatypes::DataType;
use crate::error::{ArrowError, Result};
use super::BooleanBufferBuilder;
#[derive(Debug)]
pub struct BooleanBuilder {
values_builder: BooleanBufferBuilder,
bitmap_builder: BooleanBufferBuilder,
}
impl BooleanBuilder {
pub fn new(capacity: usize) -> Self {
Self {
values_builder: BooleanBufferBuilder::new(capacity),
bitmap_builder: BooleanBufferBuilder::new(capacity),
}
}
pub fn capacity(&self) -> usize {
self.values_builder.capacity()
}
#[inline]
pub fn append_value(&mut self, v: bool) -> Result<()> {
self.bitmap_builder.append(true);
self.values_builder.append(v);
Ok(())
}
#[inline]
pub fn append_null(&mut self) -> Result<()> {
self.bitmap_builder.append(false);
self.values_builder.advance(1);
Ok(())
}
#[inline]
pub fn append_option(&mut self, v: Option<bool>) -> Result<()> {
match v {
None => self.append_null()?,
Some(v) => self.append_value(v)?,
};
Ok(())
}
#[inline]
pub fn append_slice(&mut self, v: &[bool]) -> Result<()> {
self.bitmap_builder.append_n(v.len(), true);
self.values_builder.append_slice(v);
Ok(())
}
#[inline]
pub fn append_values(&mut self, values: &[bool], is_valid: &[bool]) -> Result<()> {
if values.len() != is_valid.len() {
return Err(ArrowError::InvalidArgumentError(
"Value and validity lengths must be equal".to_string(),
));
}
self.bitmap_builder.append_slice(is_valid);
self.values_builder.append_slice(values);
Ok(())
}
pub fn finish(&mut self) -> BooleanArray {
let len = self.len();
let null_bit_buffer = self.bitmap_builder.finish();
let null_count = len - null_bit_buffer.count_set_bits();
let builder = ArrayData::builder(DataType::Boolean)
.len(len)
.add_buffer(self.values_builder.finish())
.null_bit_buffer((null_count > 0).then(|| null_bit_buffer));
let array_data = unsafe { builder.build_unchecked() };
BooleanArray::from(array_data)
}
}
impl ArrayBuilder for BooleanBuilder {
fn as_any(&self) -> &dyn Any {
self
}
fn as_any_mut(&mut self) -> &mut dyn Any {
self
}
fn into_box_any(self: Box<Self>) -> Box<dyn Any> {
self
}
fn len(&self) -> usize {
self.values_builder.len()
}
fn is_empty(&self) -> bool {
self.values_builder.is_empty()
}
fn finish(&mut self) -> ArrayRef {
Arc::new(self.finish())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_boolean_array_builder_append_slice() {
let arr1 =
BooleanArray::from(vec![Some(true), Some(false), None, None, Some(false)]);
let mut builder = BooleanArray::builder(0);
builder.append_slice(&[true, false]).unwrap();
builder.append_null().unwrap();
builder.append_null().unwrap();
builder.append_value(false).unwrap();
let arr2 = builder.finish();
assert_eq!(arr1, arr2);
}
#[test]
fn test_boolean_array_builder_append_slice_large() {
let arr1 = BooleanArray::from(vec![true; 513]);
let mut builder = BooleanArray::builder(512);
builder.append_slice(&[true; 513]).unwrap();
let arr2 = builder.finish();
assert_eq!(arr1, arr2);
}
}