[GitHub] spark pull request #19889: [SPARK-22690][ML] Imputer inherit HasOutputCols
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[GitHub] spark pull request #19889: [SPARK-22690][ML] Imputer inherit HasOutputCols
GitHub user zhengruifeng opened a pull request: https://github.com/apache/spark/pull/19889 [SPARK-22690][ML] Imputer inherit HasOutputCols ## What changes were proposed in this pull request? make `Imputer` inherit `HasOutputCols` ## How was this patch tested?