hhhizzz commented on code in PR #8607:
URL: https://github.com/apache/arrow-rs/pull/8607#discussion_r2442998645
##########
parquet/src/column/reader/decoder.rs:
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@@ -136,14 +134,75 @@ pub trait ColumnValueDecoder {
fn skip_values(&mut self, num_values: usize) -> Result<usize>;
}
+/// Bucket-based storage for decoder instances keyed by `Encoding`.
+///
+/// This replaces `HashMap` lookups with direct indexing to avoid hashing
overhead in the
+/// hot decoding paths.
+const ENCODING_SLOTS: usize = 10; // covers the encodings handled in `enc_slot`
+
+#[inline]
+fn enc_slot(e: Encoding) -> usize {
Review Comment:
Updated to use Encoding Mask, also updated the bench result in description
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