zhengruifeng created SPARK-32974:
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Summary: FeatureHasher transform optimization
Key: SPARK-32974
URL: https://issues.apache.org/jira/browse/SPARK-32974
Project: Spark
Issue Type: Improvement
Components: ML
Affects Versions: 3.1.0
Reporter: zhengruifeng
for a numerical column, its output index is a hash of its col_name, we can
pre-compute it at first, instead of computing it on each row.
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