Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/17222#discussion_r123871082
--- Diff: sql/core/src/test/java/test/org/apache/spark/sql/MyDoubleAvg.java
---
@@ -28,6 +25,9 @@
import org.apache.spark.sql.types.StructField;
import org.apache.spark.sql.types.StructType;
+import java.util.ArrayList;
+import java.util.List;
--- End diff --
the import order is wrong here, please follow the previous style
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