zhengruifeng opened a new pull request #28202: [SPARK-31433][ML] Summarizer supports string arguments URL: https://github.com/apache/spark/pull/28202 ### What changes were proposed in this pull request? Summarizer supports string arguments ### Why are the changes needed? It should be a little convenient if Summarizer supports string arguments, like other sql functions. ### Does this PR introduce any user-facing change? yes, new methods added ### How was this patch tested? existing testsuites
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