Github user NicoK commented on the issue:
https://github.com/apache/flink/pull/6115
alright - tried that change which also has the advantage of not using up
memory for the `templateKey` - these are the results from the same Benchmark
(same hardware, new software though, so I also re-did the old benchmark and ran
them twice):
```
old:
Benchmark Mode Cnt Score Error Units
KeyByBenchmarks.arrayKeyBy thrpt 30 1151.305 ± 21.096 ops/ms
KeyByBenchmarks.arrayKeyBy thrpt 30 1117.486 ± 43.508 ops/ms
KeyByBenchmarks.tupleKeyBy thrpt 30 1659.634 ± 28.627 ops/ms
KeyByBenchmarks.tupleKeyBy thrpt 30 1554.265 ± 82.604 ops/ms
new:
KeyByBenchmarks.arrayKeyBy thrpt 30 1150.552 ± 51.185 ops/ms
KeyByBenchmarks.arrayKeyBy thrpt 30 1195.777 ± 10.621 ops/ms
KeyByBenchmarks.tupleKeyBy thrpt 30 1743.633 ± 27.109 ops/ms
KeyByBenchmarks.tupleKeyBy thrpt 30 1697.885 ± 22.101 ops/ms
```
---
