Github user dsmiley commented on a diff in the pull request:
https://github.com/apache/lucene-solr/pull/416#discussion_r205119233
--- Diff:
solr/core/src/java/org/apache/solr/response/transform/ChildDocTransformerFactory.java
---
@@ -67,7 +73,9 @@
public static final String PATH_SEP_CHAR = "/";
public static final String NUM_SEP_CHAR = "#";
- private static final String sRootFilter = "*:* NOT " +
NEST_PATH_FIELD_NAME + ":*";
+ private static final BooleanQuery rootFilter = new BooleanQuery.Builder()
+ .add(new BooleanClause(new MatchAllDocsQuery(),
BooleanClause.Occur.MUST))
+ .add(new BooleanClause(new WildcardQuery(new
Term(NEST_PATH_FIELD_NAME, new BytesRef("*"))),
BooleanClause.Occur.MUST_NOT)).build();
--- End diff --
I think I suggested using DocValuesExistsQuery which only depends on the
existence of DocValues and should be efficient
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