Github user HyukjinKwon commented on a diff in the pull request: https://github.com/apache/spark/pull/21815#discussion_r203680931 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala --- @@ -270,7 +270,7 @@ case class FileSourceScanExec( private val pushedDownFilters = dataFilters.flatMap(DataSourceStrategy.translateFilter) logInfo(s"Pushed Filters: ${pushedDownFilters.mkString(",")}") - override val metadata: Map[String, String] = { + override lazy val metadata: Map[String, String] = { --- End diff -- it can be in executor side actually: ``` at org.apache.spark.sql.execution.FileSourceScanExec.<init>(DataSourceScanExec.scala:275) at org.apache.spark.sql.execution.FileSourceScanExec.doCanonicalize(DataSourceScanExec.scala:526) at org.apache.spark.sql.execution.FileSourceScanExec.doCanonicalize(DataSourceScanExec.scala:159) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized$lzycompute(QueryPlan.scala:211) at org.apache.spark.sql.catalyst.plans.QueryPlan.canonicalized(QueryPlan.scala:210) at org.apache.spark.sql.execution.FileSourceScanExecSuite$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$1.apply(FileSourceScanExecSuite.scala:30) at org.apache.spark.sql.execution.FileSourceScanExecSuite$$anonfun$1$$anonfun$apply$mcV$sp$1$$anonfun$apply$1.apply(FileSourceScanExecSuite.scala:30) at scala.collection.Iterator$class.foreach(Iterator.scala:891) at scala.collection.AbstractIterator.foreach(Iterator.scala:1334) at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:921) at org.apache.spark.rdd.RDD$$anonfun$foreach$1$$anonfun$apply$28.apply(RDD.scala:921) at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2083) at org.apache.spark.SparkContext$$anonfun$runJob$5.apply(SparkContext.scala:2083) at org.apache.spark.scheduler.ResultTask.runTask(ResultTask.scala:87) at org.apache.spark.scheduler.Task.run(Task.scala:109) at org.apache.spark.executor.Executor$TaskRunner.run(Executor.scala:367) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) at java.lang.Thread.run(Thread.java:748) ```
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