tustvold commented on code in PR #3578:
URL: https://github.com/apache/arrow-rs/pull/3578#discussion_r1082678855
##########
parquet/src/util/bit_util.rs:
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@@ -17,76 +17,104 @@
use std::{cmp, mem::size_of};
-use crate::data_type::AsBytes;
+use crate::data_type::{AsBytes, ByteArray, FixedLenByteArray, Int96};
+use crate::errors::{ParquetError, Result};
use crate::util::bit_pack::{unpack16, unpack32, unpack64, unpack8};
use crate::util::memory::ByteBufferPtr;
#[inline]
-pub fn from_ne_slice<T: FromBytes>(bs: &[u8]) -> T {
- let mut b = T::Buffer::default();
- {
- let b = b.as_mut();
- let bs = &bs[..b.len()];
- b.copy_from_slice(bs);
- }
- T::from_ne_bytes(b)
+pub fn from_le_slice<T: FromBytes>(bs: &[u8]) -> T {
+ // TODO: propagate the error (#3577)
+ T::try_from_le_slice(bs).unwrap()
}
#[inline]
-pub fn from_le_slice<T: FromBytes>(bs: &[u8]) -> T {
- let mut b = T::Buffer::default();
- {
- let b = b.as_mut();
- let bs = &bs[..b.len()];
- b.copy_from_slice(bs);
+fn array_from_slice<const N: usize>(bs: &[u8]) -> Result<[u8; N]> {
+ // Need to slice as may be called with zero-padded values
Review Comment:
I've confirmed this optimised as you would hope
https://rust.godbolt.org/z/4WPdn4j8j
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