wangyum commented on a change in pull request #24715: [SPARK-25474][SQL] Data 
source tables support fallback to HDFS for size estimation
URL: https://github.com/apache/spark/pull/24715#discussion_r314587076
 
 

 ##########
 File path: 
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSourceStrategy.scala
 ##########
 @@ -619,3 +620,35 @@ object DataSourceStrategy {
     (nonconvertiblePredicates ++ unhandledPredicates, pushedFilters, 
handledFilters)
   }
 }
+
+
+/**
+ * Support for recalculating table statistics if table statistics are not 
available.
+ */
+class DetermineTableStats(session: SparkSession) extends Rule[LogicalPlan] {
+
+  private val sessionConf = session.sessionState.conf
 
 Review comment:
   Done

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