Joseph K. Bradley created SPARK-14159:
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Summary: StringIndexerModel sets output column metadata incorrectly
Key: SPARK-14159
URL: https://issues.apache.org/jira/browse/SPARK-14159
Project: Spark
Issue Type: Bug
Components: ML
Reporter: Joseph K. Bradley
Assignee: Joseph K. Bradley
Priority: Minor
StringIndexerModel.transform sets the output column metadata to use name
inputCol. It should not. Fixing this causes a problem with the metadata
produced by RFormula.
Fix in RFormula: I added the StringIndexer columns to prefixesToRewrite, and I
modified VectorAttributeRewriter to find and replace all "prefixes" since
attributes collect multiple prefixes from StringIndexer + Interaction.
Note that "prefixes" is no longer accurate since internal strings may be
replaced.
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