Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/19623#discussion_r148176680
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/DataSourceV2Reader.java
---
@@ -40,6 +40,9 @@
* 3. Special scans. E.g, columnar scan, unsafe row scan, etc. These
scan interfaces are named
* like `SupportsScanXXX`.
*
+ * If exception happens when applying any of these query optimizations,
the action would fail and
--- End diff --
If an exception happens
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