tustvold commented on code in PR #1905:
URL: https://github.com/apache/arrow-rs/pull/1905#discussion_r901061978
##########
parquet/src/util/bit_util.rs:
##########
@@ -133,38 +133,23 @@ where
memcpy(&source.as_bytes()[..num_bytes], target)
}
-/// Returns the ceil of value/divisor
+/// Returns the ceil of value/divisor.
+///
+/// This function should be removed after
+/// [`int_roundings`](https://github.com/rust-lang/rust/issues/88581) is
stable.
#[inline]
pub fn ceil(value: i64, divisor: i64) -> i64 {
- value / divisor + ((value % divisor != 0) as i64)
-}
-
-/// Returns ceil(log2(x))
-#[inline]
-pub fn log2(mut x: u64) -> i32 {
- if x == 1 {
- return 0;
- }
- x -= 1;
- let mut result = 0;
- while x > 0 {
- x >>= 1;
- result += 1;
- }
- result
+ num::Integer::div_ceil(&value, &divisor)
}
/// Returns the `num_bits` least-significant bits of `v`
#[inline]
pub fn trailing_bits(v: u64, num_bits: usize) -> u64 {
- if num_bits == 0 {
- return 0;
- }
if num_bits >= 64 {
- return v;
+ v
+ } else {
Review Comment:
I'm not sure if this if block is actually necessary
##########
parquet/src/encodings/encoding.rs:
##########
@@ -307,12 +307,10 @@ impl<T: DataType> DictEncoder<T> {
#[inline]
fn bit_width(&self) -> u8 {
let num_entries = self.uniques.len();
- if num_entries == 0 {
- 0
- } else if num_entries == 1 {
- 1
+ if num_entries <= 1 {
+ num_entries as u8
} else {
- log2(num_entries as u64) as u8
+ num_required_bits(num_entries as u64 - 1)
Review Comment:
Is this actually correct? Or was this a pre-existing bug. Why is the bit
width here 1 less?
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