Github user mallman commented on a diff in the pull request:
https://github.com/apache/spark/pull/14690#discussion_r77426759
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/fileSourceInterfaces.scala
---
@@ -346,11 +340,30 @@ trait FileCatalog {
*/
def listFiles(filters: Seq[Expression]): Seq[Partition]
+ /** Refresh any cached file listings */
+ def refresh(): Unit
+
+ /** Sum of table file sizes, in bytes */
+ def sizeInBytes: Long
+}
+
+/**
+ * A [[BasicFileCatalog]] which can enumerate all of the files comprising
a relation and, from
+ * those, infer the relation's partition specification.
+ */
+trait FileCatalog extends BasicFileCatalog {
--- End diff --
Yes, I want to avoid/discourage file traversals of partitions which aren't
part of a user's query. Moving `allFiles()` out of the root of the file catalog
hierarchy let's us omit it from `TableFileCatalog`.
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