mkarbo commented on code in PR #7535:
URL: https://github.com/apache/arrow-rs/pull/7535#discussion_r2104428765
##########
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(),
+ ));
+ }
+ Ok(Self {
+ bytes,
+ header,
+ dict_size,
+ })
+ }
+
/// Whether the dictionary keys are sorted and unique
pub fn is_sorted(&self) -> bool {
- todo!()
+ self.header.is_sorted
}
- /// Get the dict length
- pub fn dict_len(&self) -> Result<usize, ArrowError> {
- let end_location = self.offset_size()? as usize + 1;
- if self.bytes.len() < end_location {
- let err_str = format!(
- "Invalid metadata bytes, must have at least length {} but has
length {}",
- &end_location,
- self.bytes.len()
- );
- return Err(ArrowError::InvalidArgumentError(err_str));
- }
- let dict_len_bytes = &self.bytes[1..end_location];
- let dict_len =
usize::from_le_bytes(dict_len_bytes.try_into().map_err(|e| {
- ArrowError::InvalidArgumentError(format!(
- "Unable to convert dictionary_size bytes into usize: {}",
- e,
- ))
- })?);
- Ok(dict_len)
+ /// Get the dictionary size
+ pub fn dictionary_size(&self) -> usize {
+ self.dict_size
}
- pub fn version(&self) -> usize {
- todo!()
+ pub fn version(&self) -> u8 {
+ self.header.version
}
- /// Get the offset by index
- pub fn get_offset_by(&self, index: usize) -> Result<usize, ArrowError> {
- todo!()
+ /// Get the offset by key-index
+ pub fn get_offset_by(&self, index: usize) -> Result<Range<usize>,
ArrowError> {
Review Comment:
You're right, added another method. Code is nearly duplicate, but it avoids
2 calls to `unpack_usize` this way.
Could also just call the single-version twice in the double, or make a
helper, but felt like the trade-off in extra code was not worth it. Happy to
change it, lmk.
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