cloud-fan commented on a change in pull request #25460: 
[SPARK-25474][SQL][FOLLOW-UP] fallback to hdfs when relation table stats is not 
available
URL: https://github.com/apache/spark/pull/25460#discussion_r314559804
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/HadoopFsRelation.scala
 ##########
 @@ -72,7 +72,8 @@ case class HadoopFsRelation(
     val compressionFactor = sqlContext.conf.fileCompressionFactor
     val defaultSize = (location.sizeInBytes * compressionFactor).toLong
     location match {
-      case cfi: CatalogFileIndex if 
sparkSession.sessionState.conf.fallBackToHdfsForStatsEnabled =>
+      case cfi: CatalogFileIndex if 
sparkSession.sessionState.conf.fallBackToHdfsForStatsEnabled
+        && defaultSize == sqlContext.conf.defaultSizeInBytes =>
 
 Review comment:
   Ah good point! Basically there is no way to tell the table stats are 
available or not at this point. `sqlContext.conf.defaultSizeInBytes` is 
configurable and it's possible that the table stats just equal to 
`sqlContext.conf.defaultSizeInBytes`.
   
   #24715 seems to be able to fix it.

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