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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