Github user arina-ielchiieva commented on a diff in the pull request:
https://github.com/apache/drill/pull/877#discussion_r132413275
--- 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 --
It seems you set metadata context, when there can be the cases when it is
still null? Also can you please explain why there are so many checks in the
code if meta context is null, can we make sure it always exists?
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