tisonkun commented on code in PR #210:
URL: https://github.com/apache/datasketches-rust/pull/210#discussion_r3848768284
##########
datasketches/tests/serde_tests/tdigest.rs:
##########
@@ -25,6 +26,47 @@ use googletest::prelude::near;
use crate::serialization_test_data;
+fn fnv1a(bytes: &[u8]) -> u64 {
+ bytes.iter().fold(0xcbf2_9ce4_8422_2325, |hash, byte| {
+ (hash ^ u64::from(*byte)).wrapping_mul(0x0000_0100_0000_01b3)
+ })
+}
+
+fn patterned_digest(k: u16, len: usize, salt: usize) -> TDigestMut {
+ let mut tdigest = TDigestMut::new(k);
+ for index in 0..len {
+ let value = (((index * 37 + salt * 17) % 101) as f64) - 50.0;
+ tdigest.update(value);
+ }
+ tdigest
+}
+
+fn native_image(
+ k: u16,
+ reverse_merge: bool,
+ min: f64,
+ max: f64,
+ centroids: &[(f64, u64)],
+ buffered: &[f64],
+) -> Vec<u8> {
+ let mut bytes = Vec::with_capacity(32 + size_of_val(centroids) +
size_of_val(buffered));
+ bytes.extend_from_slice(&[2, 1, 20]); // preamble longs, serial version,
family
+ bytes.extend_from_slice(&k.to_le_bytes());
+ bytes.extend_from_slice(&[if reverse_merge { 4 } else { 0 }, 0, 0]);
+ bytes.extend_from_slice(&(centroids.len() as u32).to_le_bytes());
+ bytes.extend_from_slice(&(buffered.len() as u32).to_le_bytes());
+ bytes.extend_from_slice(&min.to_le_bytes());
+ bytes.extend_from_slice(&max.to_le_bytes());
+ for &(mean, weight) in centroids {
+ bytes.extend_from_slice(&mean.to_le_bytes());
+ bytes.extend_from_slice(&weight.to_le_bytes());
+ }
+ for value in buffered {
+ bytes.extend_from_slice(&value.to_le_bytes());
+ }
+ bytes
+}
Review Comment:
Resolved below.
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