zhengruifeng opened a new pull request #27037: [SPARK-30376][ML] Unify the computation of numFeatures URL: https://github.com/apache/spark/pull/27037 ### What changes were proposed in this pull request? using `MetadataUtils.getNumFeatures` to extract the numFeatures ### Why are the changes needed? may avoid `first`/`head` job if metadata has attrGroup ### Does this PR introduce any user-facing change? No ### How was this patch tested? existing testsuites
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