etseidl commented on PR #9945:
URL: https://github.com/apache/arrow-rs/pull/9945#issuecomment-4400226858
bench results look weird. On x86 WS got
```
group bool
main
----- ----
----
decode metadata (wide) with schema 1.00 15.5±0.12ms
? ?/sec 1.09 16.9±0.13ms ? ?/sec
decode metadata (wide) with skip PES 1.00 15.6±0.23ms
? ?/sec 1.09 17.1±0.23ms ? ?/sec
decode metadata (wide) with skip all stats 1.00 18.0±0.10ms
? ?/sec 1.08 19.4±0.10ms ? ?/sec
decode metadata (wide) with skip column stats 1.00 17.0±0.11ms
? ?/sec 1.08 18.3±0.15ms ? ?/sec
decode metadata (wide) with skip size stats 1.00 18.2±0.12ms
? ?/sec 1.11 20.1±0.11ms ? ?/sec
decode metadata (wide) with stats mask 1.00 15.6±0.10ms
? ?/sec 1.09 17.1±0.11ms ? ?/sec
decode metadata with schema 1.00 2.6±0.01µs
? ?/sec 1.05 2.8±0.02µs ? ?/sec
decode metadata with skip PES 1.00 4.5±0.06µs
? ?/sec 1.04 4.7±0.05µs ? ?/sec
decode metadata with skip column stats 1.00 4.7±0.02µs
? ?/sec 1.03 4.8±0.05µs ? ?/sec
decode metadata with stats mask 1.00 4.5±0.06µs
? ?/sec 1.05 4.7±0.06µs ? ?/sec
decode parquet metadata 1.00 4.8±0.05µs
? ?/sec 1.06 5.1±0.02µs ? ?/sec
decode parquet metadata (wide) 1.00 17.3±0.31ms
? ?/sec 1.08 18.7±0.24ms ? ?/sec
decode parquet metadata no path_in_schema (wide) 1.00 16.7±0.08ms
? ?/sec 1.09 18.2±0.11ms ? ?/sec
decode parquet metadata w/ size stats (wide) 1.00 21.0±0.19ms
? ?/sec 1.07 22.4±0.28ms ? ?/sec
open(default) 1.00 5.3±0.02µs
? ?/sec 1.04 5.5±0.03µs ? ?/sec
open(page index) 1.00 94.4±1.19µs
? ?/sec 1.02 96.4±2.76µs ? ?/sec
```
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