Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/186#discussion_r41035620
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java
---
@@ -716,6 +726,7 @@ public String toString() {
return "ParquetGroupScan [entries=" + entries
+ ", selectionRoot=" + selectionRoot
+ ", numFiles=" + getEntries().size()
+ + ", usedCache=" + usedMetadataCache
--- End diff --
This is a useful attribute; however usedCache might be misinterpreted to
mean data cache. usedMetadataCache is more explicit (although the term 'cache'
itself is misleading - here we are referring to file cache on disk, not
in-memory). Another thing: is a boolean value sufficient ? if there are 2
subdirectories and only one of them has the metadata cache, and I query the
parent directory: would the cache get used for one of the subdirectories and if
so, what would this flag indicate ? It sounds like if the parent directory has
the cache, then it will be true, otherwise false.
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