Github user rdblue commented on a diff in the pull request:
https://github.com/apache/spark/pull/21029#discussion_r182596274
--- Diff:
sql/core/src/main/java/org/apache/spark/sql/sources/v2/reader/streaming/MicroBatchReader.java
---
@@ -17,12 +17,12 @@
package org.apache.spark.sql.sources.v2.reader.streaming;
+import java.util.Optional;
--- End diff --
Nit: this is a cosmetic change that should be reverted before committing.
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