Github user amansinha100 commented on a diff in the pull request:
https://github.com/apache/drill/pull/575#discussion_r75978095
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetGroupScan.java
---
@@ -173,8 +173,18 @@ public ParquetGroupScan( //
final FileSelection fileSelection = expandIfNecessary(selection);
this.entries = Lists.newArrayList();
- for (String fileName : fileSelection.getFiles()) {
- entries.add(new ReadEntryWithPath(fileName));
+ if (fileSelection.getMetaContext() != null &&
+ (fileSelection.getMetaContext().wasPruningStarted() &&
+ ! fileSelection.getMetaContext().wasPruned())) {
+ // if pruning was attempted and nothing was pruned, initialize the
entries with just
+ // the selection root instead of the fully expanded list to reduce
overhead. The fully
+ // expanded list is already stored as part of the fileSet.
+ // TODO: at some point we should examine whether the list of entries
is absolutely needed.
--- End diff --
Will create a JIRA.
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