huaxingao opened a new pull request #26247: [SPARK-29566][ML] Imputer should support single-column input/output URL: https://github.com/apache/spark/pull/26247 ### What changes were proposed in this pull request? add single-column input/output support in Imputer ### Why are the changes needed? Currently, Imputer only has multi-column support. This PR adds single-column input/output support. ### Does this PR introduce any user-facing change? Yes. add single-column input/output support in Imputer ```Imputer.setInputCol``` ```Imputer.setOutputCol``` ### How was this patch tested? add unit tests
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