Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19623#discussion_r148217006
--- 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 --
we only have one so I don't know how to category them... We can do this
after having more optimizations
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