zhengruifeng commented on pull request #29850:
URL: https://github.com/apache/spark/pull/29850#issuecomment-698127269
Scala 2.13 building fail due to:
```
Error: ]
/home/runner/work/spark/spark/mllib/src/main/scala/org/apache/spark/ml/feature/FeatureHasher.scala:137:
type mismatch;
found : (String, Int) => Int
required: String => ?
Error: ]
/home/runner/work/spark/spark/mllib/src/main/scala/org/apache/spark/ml/feature/FeatureHasher.scala:140:
type mismatch;
found : (String, Int) => Int
required: String => ?
```
I will try to fix it.
> what is the performance speedup that we get from this optimization? Is it
significant?
@MLnick I am preparing a performance test, and will post the result ASAP.
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