Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/15568#discussion_r84421537 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/TableFileCatalog.scala --- @@ -102,6 +95,13 @@ class TableFileCatalog( } override def inputFiles: Array[String] = allPartitions.inputFiles + + override def equals(o: Any): Boolean = o match { --- End diff -- Under hive context, we will cache the `LogicalRelation` for every data source table(including converted from hive), which means every table will always have a `TableFileCatalog` of same instance. However, it's not true in sql core. We will re-construct the `TableFileCatalog` and `LogicalRelation` everytime we look up a table. Thus we may encounter cache miss even if the table is cached, because `TableFileCatalog` of difference instances never equal to each other. Although it's not a real problem now, I think it's reasonable to follow `ListFileCatalong` and add the `equals` and `hashCode`
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