etseidl commented on code in PR #6870:
URL: https://github.com/apache/arrow-rs/pull/6870#discussion_r1884614979
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parquet/src/column/writer/mod.rs:
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@@ -1444,15 +1444,31 @@ fn increment(mut data: Vec<u8>) -> Option<Vec<u8>> {
/// Try and increment the the string's bytes from right to left, returning
when the result
/// is a valid UTF8 string. Returns `None` when it can't increment any byte.
fn increment_utf8(mut data: Vec<u8>) -> Option<Vec<u8>> {
+ const UTF8_CONTINUATION: u8 = 0x80;
+ const UTF8_CONTINUATION_MASK: u8 = 0xc0;
+
+ let mut len = data.len();
for idx in (0..data.len()).rev() {
let original = data[idx];
let (byte, overflow) = original.overflowing_add(1);
if !overflow {
data[idx] = byte;
if str::from_utf8(&data).is_ok() {
Review Comment:
Yes, the `str::from_utf8` call was deadly. Now removed.
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