Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19623#discussion_r148176992
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/writer/DataSourceV2Writer.java
---
@@ -30,6 +30,9 @@
* It can mix in various writing optimization interfaces to speed up the
data saving. The actual
* writing logic is delegated to {@link DataWriter}.
*
+ * If exception happens when applying any of these writing optimizations,
the action would fail and
--- End diff --
an exception.
By the way, not related to this PR, shall we also list allowed writing
optimizations like [in
DataSourceV2Reader](https://github.com/apache/spark/pull/19623/files#diff-f7f970e9684796e2120223d1153302e4R35)
?
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