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Replace substring BufferBuilders with Vec #10634

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Replace substring BufferBuilders with Vec #10634

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15 changes: 7 additions & 8 deletions arrow-string/src/substring.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,6 @@
//! Supported array types:
//! [GenericStringArray], [GenericBinaryArray], [FixedSizeBinaryArray], [DictionaryArray]

use arrow_array::builder::BufferBuilder;
use arrow_array::cast::AsArray;
use arrow_array::types::*;
use arrow_array::*;
Expand Down Expand Up @@ -169,27 +168,27 @@ fn substring_by_char_impl<OffsetSize: OffsetSizeTrait, F: Fn(&str) -> (usize, us
max_element_len: Option<usize>,
bounds: F,
) -> GenericStringArray<OffsetSize> {
let mut vals = BufferBuilder::<u8>::new({
let mut vals = Vec::with_capacity({
let offsets = array.value_offsets();
let input_len = (offsets[array.len()] - offsets[0]).to_usize().unwrap();
match max_element_len {
Some(len) => input_len.min(array.len().saturating_mul(len)),
None => input_len,
}
});
let mut new_offsets = BufferBuilder::<OffsetSize>::new(array.len() + 1);
new_offsets.append(OffsetSize::zero());
let mut new_offsets = Vec::with_capacity(array.len() + 1);
new_offsets.push(OffsetSize::zero());

array.iter().for_each(|val| {
if let Some(val) = val {
let (start_offset, end_offset) = bounds(val);
vals.append_slice(&val.as_bytes()[start_offset..end_offset]);
vals.extend_from_slice(&val.as_bytes()[start_offset..end_offset]);
}
new_offsets.append(OffsetSize::from_usize(vals.len()).unwrap());
new_offsets.push(OffsetSize::from_usize(vals.len()).unwrap());
});

let offsets = OffsetBuffer::new(new_offsets.finish().into());
let values = vals.finish();
let offsets = OffsetBuffer::new(new_offsets.into());
let values = vals.into();
let nulls = array
.nulls()
.map(|n| n.inner().sliced())
Expand Down
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