Github user wzhfy commented on a diff in the pull request:
https://github.com/apache/spark/pull/18334#discussion_r122790775
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/InsertIntoHadoopFsRelationCommand.scala
---
@@ -161,6 +161,11 @@ case class InsertIntoHadoopFsRelationCommand(
fileIndex.foreach(_.refresh())
// refresh data cache if table is cached
sparkSession.catalog.refreshByPath(outputPath.toString)
+
+ if (catalogTable.nonEmpty) {
+ CommandUtils.updateTableStats(sparkSession, catalogTable.get)
--- End diff --
It's difficult to get the size of `query` in insert command.
Besides, I personally prefer simple implementation here, because usually
the overhead of scanning files is negligible compared to the append operation.
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