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https://issues.apache.org/jira/browse/SPARK-6916?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495154#comment-14495154
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Xiangrui Meng commented on SPARK-6916:
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It outputs a new column. The semantics changed after transformation, from a
column of string labels to a column of indices. I think user should find the
metadata in the original column instead of the generated column.
> StringIndexer should preserve non-ML metadata
> ---------------------------------------------
>
> Key: SPARK-6916
> URL: https://issues.apache.org/jira/browse/SPARK-6916
> Project: Spark
> Issue Type: Improvement
> Components: ML
> Affects Versions: 1.4.0
> Reporter: Joseph K. Bradley
> Priority: Minor
>
> StringIndexer sets the output column metadata to hold the ML-specific
> metadata created after indexing the column. It does not carry over non-ML
> metadata from the input column. I figure it should. (That's the behavior I
> used for VectorIndexer.)
> Ping [~mengxr]
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