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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2018/10/10 09:15:00 UTC

[jira] [Created] (SPARK-25700) Avoid to create a readsupport at write path in Data Source V2

Hyukjin Kwon created SPARK-25700:
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             Summary: Avoid to create a readsupport at write path in Data Source V2
                 Key: SPARK-25700
                 URL: https://issues.apache.org/jira/browse/SPARK-25700
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Hyukjin Kwon


https://github.com/apache/spark/commit/5fef6e3513d6023a837c427d183006d153c7102b introduced append mode support in Datasource V2.

The problem is, write path ended up 

https://github.com/apache/spark/blob/e06da95cd9423f55cdb154a2778b0bddf7be984c/sql/core/src/main/scala/org/apache/spark/sql/DataFrameWriter.scala#L249

Retrieving the physical schema of the underlying storage is potentially expensive. Actually even worse: it looks odd that write path requires read side's schema.

This is a regression comparing to Spark 2.3.



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