Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/19623#discussion_r148145901
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/ReadSupport.java ---
@@ -30,6 +30,8 @@
/**
* Creates a {@link DataSourceV2Reader} to scan the data from this data
source.
*
+ * If this method fails(throw exception), the query fails before
submitting any Spark jobs.
--- End diff --
> If an exception was thrown, the action would fail and we guarantee that
no Spark job was submitted.
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