Github user wangmiao1981 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/14553#discussion_r75962073
  
    --- Diff: 
sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/socket.scala 
---
    @@ -24,21 +24,24 @@ import java.text.SimpleDateFormat
     import java.util.Calendar
     import javax.annotation.concurrent.GuardedBy
     
    -import scala.collection.mutable.ArrayBuffer
    +import scala.collection.mutable.ListBuffer
     import scala.util.{Failure, Success, Try}
     
     import org.apache.spark.internal.Logging
    -import org.apache.spark.sql.{AnalysisException, DataFrame, SQLContext}
    +import org.apache.spark.sql._
     import org.apache.spark.sql.sources.{DataSourceRegister, 
StreamSourceProvider}
     import org.apache.spark.sql.types.{StringType, StructField, StructType, 
TimestampType}
     
    +
     object TextSocketSource {
       val SCHEMA_REGULAR = StructType(StructField("value", StringType) :: Nil)
       val SCHEMA_TIMESTAMP = StructType(StructField("value", StringType) ::
         StructField("timestamp", TimestampType) :: Nil)
       val DATE_FORMAT = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")
     }
     
    +
    --- End diff --
    
    Extra blank line


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