mkarbo commented on code in PR #7535:
URL: https://github.com/apache/arrow-rs/pull/7535#discussion_r2104379377
##########
parquet-variant/src/variant.rs:
##########
@@ -18,158 +109,223 @@ impl<'m> VariantMetadata<'m> {
self.bytes
}
+ pub fn try_new(bytes: &'m [u8]) -> Result<Self, ArrowError> {
+ let header = VariantMetadataHeader::try_new(bytes)?;
+ // Offset 1, index 0 because first element after header is dictionary
size
+ let dict_size = header.offset_size.unpack_usize(bytes, 1, 0)?;
+
+ // TODO: Refactor, add test for validation
+ let valid = (0..=dict_size)
+ .map(|i| header.offset_size.unpack_usize(bytes, 1, i + 1))
+ .scan(0, |prev, cur| {
+ let Ok(cur_offset) = cur else {
+ return Some(false);
+ };
+ // Skip the first offset, which is always 0
+ if *prev == 0 {
+ *prev = cur_offset;
+ return Some(true);
+ }
+
+ let valid = cur_offset > *prev;
+ *prev = cur_offset;
+ Some(valid)
+ })
+ .all(|valid| valid);
+
+ if !valid {
+ return Err(ArrowError::InvalidArgumentError(
+ "Offsets are not monotonically increasing".to_string(),
+ ));
Review Comment:
refactored, but kept the pre-validation for now
##########
parquet-variant/src/variant.rs:
##########
@@ -18,158 +109,223 @@ impl<'m> VariantMetadata<'m> {
self.bytes
}
+ pub fn try_new(bytes: &'m [u8]) -> Result<Self, ArrowError> {
+ let header = VariantMetadataHeader::try_new(bytes)?;
+ // Offset 1, index 0 because first element after header is dictionary
size
+ let dict_size = header.offset_size.unpack_usize(bytes, 1, 0)?;
+
+ // TODO: Refactor, add test for validation
+ let valid = (0..=dict_size)
+ .map(|i| header.offset_size.unpack_usize(bytes, 1, i + 1))
+ .scan(0, |prev, cur| {
+ let Ok(cur_offset) = cur else {
+ return Some(false);
+ };
+ // Skip the first offset, which is always 0
Review Comment:
Added checks :)
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