dnhatn commented on a change in pull request #214:
URL: https://github.com/apache/lucene/pull/214#discussion_r672315261
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File path: lucene/core/src/java/org/apache/lucene/index/DirectoryReader.java
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@@ -122,6 +122,23 @@ public static DirectoryReader open(final IndexCommit
commit) throws IOException
return StandardDirectoryReader.open(commit.getDirectory(), commit, null);
}
+ /**
+ * Expert: returns an IndexReader reading the index in the given {@link
IndexCommit}.
+ *
+ * @param commit the commit point to open
+ * @param leafSorter a comparator for sorting leaf readers. Providing
leafSorter is useful for
+ * indices on which it is expected to run many queries with particular
sort criteria (e.g. for
+ * time-based indices, this is usually a descending sort on timestamp).
In this case {@code
+ * leafSorter} should sort leaves according to this sort criteria.
Providing leafSorter allows
+ * to speed up this particular type of sort queries by early terminating
while iterating
+ * through segments and segments' documents
+ * @throws IOException if there is a low-level IO error
+ */
+ public static DirectoryReader open(final IndexCommit commit,
Comparator<LeafReader> leafSorter)
Review comment:
I think we also need to add another method that supports both
`leafSorter` and `minSupportedMajorVersion`?
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