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From "Takuya Ueshin (JIRA)" <j...@apache.org>
Subject [jira] [Created] (SPARK-24871) Refactor Concat and MapConcat to avoid creating concatenator object for each row.
Date Fri, 20 Jul 2018 03:51:00 GMT
Takuya Ueshin created SPARK-24871:
-------------------------------------

             Summary: Refactor Concat and MapConcat to avoid creating concatenator object
for each row.
                 Key: SPARK-24871
                 URL: https://issues.apache.org/jira/browse/SPARK-24871
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Takuya Ueshin


Refactor {{Concat}} and {{MapConcat}} to:
 - avoid creating concatenator object for each row.
 - make {{Concat}} handle {{containsNull}} properly.
 - make {{Concat}} shortcut if {{null}} child is found.



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