zhengruifeng created SPARK-27944:
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Summary: Unify the behavior of checking empty output column names
Key: SPARK-27944
URL: https://issues.apache.org/jira/browse/SPARK-27944
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 3.0.0
Reporter: zhengruifeng
In some algs (LDA, DT, GBTC, SVC, LR, MLP, NB), the transform method will check
whether an output column name is empty, and if all names are empty, it will log
a warning msg and do nothing.
It maybe better to make other algs (regression, ovr, clustering, als) also
check the output columns before transformation.
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