Github user adeneche commented on a diff in the pull request:
https://github.com/apache/drill/pull/345#discussion_r52519003
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java
---
@@ -521,6 +543,25 @@ public void setEndpointByteMap(EndpointByteMap
byteMap) {
}
}
+ private FileSelection
+ getSelectionFromMetadataCache(DrillFileSystem fs, FileSelection
selection) throws IOException {
+ FileStatus metaRootDir = selection.getFirstPath(fs);
+ Path metaFilePath = new Path(metaRootDir.getPath(),
Metadata.METADATA_FILENAME);
+
+ // get the metadata for the directory by reading the metadata file
+ Metadata.ParquetTableMetadataBase metadata =
Metadata.readBlockMeta(fs, metaFilePath.toString());
+ List<String> fileNames = Lists.newArrayList();
+ for (Metadata.ParquetFileMetadata file : metadata.getFiles()) {
+ fileNames.add(file.getPath());
+ }
+ // when creating the file selection, set the selection root in the
form /a/b instead of
+ // file:/a/b. The reason is that the file names above have been
created in the form
+ // /a/b/c.parquet and the format of the selection root must match that
of the file names
+ // otherwise downstream operations such as partition pruning can break.
+ final Path metaRootPath =
Path.getPathWithoutSchemeAndAuthority(metaRootDir.getPath());
+ return FileSelection.create(selection.getStatuses(fs), fileNames,
metaRootPath.toString());
--- End diff --
`FileSelection.create()` expects either a list of statuses or a list of
filenames, but not both.
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