wangyum commented on PR #48128:
URL: https://github.com/apache/spark/pull/48128#issuecomment-2354430832
+1. `HashMap` is much faster than `AnyRefMap` since Scala 2.13.0
scala 2.13.8:
```
OpenJDK 64-Bit Server VM 1.8.0_382-b05 on Mac OS X 14.5
Apple M2 Max
Benchmark Map: Best Time(ms) Avg Time(ms)
Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
HashMap 1121 1126
3 0.0 280264.2 1.0X
AnyRefMap 1590 1609
29 0.0 397386.4 0.7X
```
scala 2.12.18:
```
OpenJDK 64-Bit Server VM 1.8.0_382-b05 on Mac OS X 14.5
Apple M2 Max
Benchmark Map: Best Time(ms) Avg Time(ms)
Stdev(ms) Rate(M/s) Per Row(ns) Relative
------------------------------------------------------------------------------------------------------------------------
HashMap 1679 1689
11 0.0 419759.2 1.0X
AnyRefMap 1585 1592
8 0.0 396357.1 1.1X
```
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