Dandandan commented on code in PR #9236:
URL: https://github.com/apache/arrow-rs/pull/9236#discussion_r2712599402
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parquet/src/arrow/array_reader/byte_view_array.rs:
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@@ -469,32 +480,32 @@ impl ByteViewArrayDecoderDictionary {
// then the base_buffer_idx is 5 - 2 = 3
let base_buffer_idx = output.buffers.len() as u32 - dict.buffers.len()
as u32;
- self.decoder.read(len, |keys| {
- for k in keys {
- let view = dict
- .views
- .get(*k as usize)
- .ok_or_else(|| general_err!("invalid key={} for
dictionary", *k))?;
- let len = *view as u32;
- if len <= 12 {
- // directly append the view if it is inlined
- // Safety: the view is from the dictionary, so it is valid
- unsafe {
- output.append_raw_view_unchecked(view);
+ let mut error = None;
+ let read = self.decoder.read(len, |keys| {
+ output
+ .views
+ .extend(keys.iter().map(|k| match dict.views.get(*k as usize) {
Review Comment:
This is the largest optimization.
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