Github user vdiravka commented on a diff in the pull request:
https://github.com/apache/drill/pull/877#discussion_r133159772
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java
---
@@ -268,11 +276,15 @@ private FileSelection expandIfNecessary(FileSelection
selection) throws IOExcept
// use the cacheFileRoot if provided (e.g after partition pruning)
Path metaFilePath = new Path(cacheFileRoot != null ? cacheFileRoot :
selectionRoot, Metadata.METADATA_FILENAME);
if (!fs.exists(metaFilePath)) { // no metadata cache
+ MetadataContext metaContext = selection.getMetaContext();
--- End diff --
Started using metadata context as a ParquetGroupScan field.
The complexity was with initializing entries with selection root. There was
a check when metadata context is null. The fact that it was not null only in
case, when metadata directories file is present and using (in that case
metadata context was created).
Added method with javadoc explaining in what cases entries are set as
selection root.
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