Github user aai95 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/22253#discussion_r213944953
  
    --- Diff: 
sql/core/src/test/java/test/org/apache/spark/sql/JavaColumnExpressionSuite.java 
---
    @@ -0,0 +1,80 @@
    +package test.org.apache.spark.sql;
    +
    +import org.apache.spark.api.java.function.FilterFunction;
    +import org.apache.spark.sql.Column;
    +import org.apache.spark.sql.Dataset;
    +import org.apache.spark.sql.Row;
    +import org.apache.spark.sql.RowFactory;
    +import org.apache.spark.sql.test.TestSparkSession;
    +import org.apache.spark.sql.types.StructType;
    +import org.junit.After;
    +import org.junit.Assert;
    +import org.junit.Before;
    +import org.junit.Test;
    +
    +import java.util.*;
    +
    +import static org.apache.spark.sql.types.DataTypes.*;
    --- End diff --
    
    Hello @HyukjinKwon, I tried to remove the wildcard import and got the 
following result:
    
    `import java.util.ArrayList;`
    `import java.util.Arrays;`
    `import java.util.HashSet;`
    `import java.util.List;`
    `import java.util.Locale;`
    
    `import static org.apache.spark.sql.types.DataTypes.IntegerType;`
    `import static org.apache.spark.sql.types.DataTypes.StringType;`
    `import static org.apache.spark.sql.types.DataTypes.createArrayType;`
    `import static org.apache.spark.sql.types.DataTypes.createStructField;`
    `import static org.apache.spark.sql.types.DataTypes.createStructType;`
    
    Is it OK to use wildcard here if exactly 5 imports were used in every case? 
Thanks.


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