huaxingao opened a new pull request #27882: [SPARK-31127][ML] Add abstract Selector URL: https://github.com/apache/spark/pull/27882 ### What changes were proposed in this pull request? Add abstract ```Selector```. Put the common code between ```ChiSqSelector``` and ```FValueSelector``` to ```Selector```. ### Why are the changes needed? Code reuse. ### Does this PR introduce any user-facing change? Yes. Add ```pValues``` and ```statistics``` to ```SelectorModel``` ### How was this patch tested? New and existing tests
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