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Posted to issues@spark.apache.org by "Adam Binford (Jira)" <ji...@apache.org> on 2021/10/04 01:14:00 UTC

[jira] [Created] (SPARK-36918) unionByName shouldn't consider types when comparing structs

Adam Binford created SPARK-36918:
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             Summary: unionByName shouldn't consider types when comparing structs
                 Key: SPARK-36918
                 URL: https://issues.apache.org/jira/browse/SPARK-36918
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 3.2.0
            Reporter: Adam Binford


Improvement/follow-on of https://issues.apache.org/jira/browse/SPARK-35290.

We use StructType.sameType to see if we need to recreate the struct, but this can lead to false positives if the structure is the same but the types are different, and will lead to simply creating a new struct that's exactly the same as the original. This can cause significant overhead when unioning multiple deeply nested nullable structs, as each time it's recreated it gets wrapped in a If(IsNull()). Only comparing the field names can lead to more efficient plans.



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