Github user budde commented on a diff in the pull request:
https://github.com/apache/spark/pull/16944#discussion_r104085920
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveMetastoreCatalog.scala ---
@@ -195,17 +207,20 @@ private[hive] class
HiveMetastoreCatalog(sparkSession: SparkSession) extends Log
fileFormatClass,
None)
val logicalRelation = cached.getOrElse {
+ val fileIndex = new InMemoryFileIndex(sparkSession,
Seq(rootPath), options, None)
--- End diff --
I was thinking that ```InMemoryFileIndex``` had similar semantics to
```CatalogFileIndex``` where the leaf files are only listed if
```listFiles()``` is invoked. I can make the ```fileIndex``` arg of
```inferIfNeeded()``` a ```Option[FileIndex]``` and create the
```InMemoryFileIndex``` within that method instead if we need to infer a schema
and no file index is provided.
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