viirya commented on code in PR #7935:
URL: https://github.com/apache/arrow-rs/pull/7935#discussion_r2217930441
##########
parquet-variant/src/builder.rs:
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@@ -1134,39 +1197,86 @@ impl<'a> ObjectBuilder<'a> {
)));
}
- let data_size = self.buffer.offset();
- let num_fields = self.fields.len();
- let is_large = num_fields > u8::MAX as usize;
+ let metadata_builder = self.parent_state.metadata_builder();
self.fields.sort_by(|&field_a_id, _, &field_b_id, _| {
- let key_a = &metadata_builder.field_name(field_a_id as usize);
- let key_b = &metadata_builder.field_name(field_b_id as usize);
- key_a.cmp(key_b)
+ let field_a_name = metadata_builder.field_name(field_a_id as
usize);
+ let field_b_name = metadata_builder.field_name(field_b_id as
usize);
+ field_a_name.cmp(field_b_name)
});
- let max_id = self.fields.iter().map(|(i, _)| *i).max().unwrap_or(0);
+ // the length of the metadata's field names is a very cheap to compute
the upper bound.
+ // it will almost always be a tight upper bound as well -- it would
take a pretty
+ // carefully crafted object to use only the early field ids of a
large dictionary.
+ let max_id = metadata_builder.field_names.len();
+ let id_size = int_size(max_id);
- let id_size = int_size(max_id as usize);
+ let parent_buffer = self.parent_state.buffer();
+ let current_offset = parent_buffer.offset();
+ // current object starts from `object_start_offset`
+ let data_size = current_offset - self.object_start_offset;
Review Comment:
Oh, I forgot that parent status has exclusively access to the parent buffer.
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