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Posted to issues@spark.apache.org by "Liang-Chi Hsieh (JIRA)" <ji...@apache.org> on 2019/05/05 04:53:00 UTC

[jira] [Created] (SPARK-27633) Remove redundant aliases in NestedColumnAliasing

Liang-Chi Hsieh created SPARK-27633:
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             Summary: Remove redundant aliases in NestedColumnAliasing
                 Key: SPARK-27633
                 URL: https://issues.apache.org/jira/browse/SPARK-27633
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.0.0
            Reporter: Liang-Chi Hsieh


In NestedColumnAliasing rule, we create aliases for nested field access in project list. We considered that top level parent field and nested fields under it were both accessed. In the case, we don't create the aliases because they are redundant.

There is another case, where a nested parent field and nested fields under it were both accessed, which we don't consider now. We don't need to create aliases in this case too.





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