KeiichiHirobe commented on issue #23288: [SPARK-26339][SQL]Throws better exception when reading files that start with underscore URL: https://github.com/apache/spark/pull/23288#issuecomment-450107185 I implemented a new behavior and added tests. Please check it! In `checkAndGlobPathIfNecessary`, calling `InMemoryFileIndex.bulkListLeafFiles`. I am not familiar with cost of calling `InMemoryFileIndex.bulkListLeafFiles`, is this expensive? If so, maybe we should implement a new method in `object InMemoryFileIndex` which returns information of filtered out files/directories and whether filtered files(regular files) exist or not. And, please note that I considerd for not only `InMemoryFileIndex.shouldFilterOut` but also `PathFilter.accept`.
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