Trejkaz created LUCENE-7266:
-------------------------------
Summary: QueryNode#cloneTree produces a new tree where parents are
not correctly set
Key: LUCENE-7266
URL: https://issues.apache.org/jira/browse/LUCENE-7266
Project: Lucene - Core
Issue Type: Bug
Components: modules/queryparser
Reporter: Trejkaz
The following unit test performs a sanity check on the QueryNode tree, checking
that each node has the parent set to the same node it was retrieved from. After
calling cloneTree, this check fails on the returned node, as the parents in the
cloned node still point back into the original tree.
{code}
import java.util.Arrays;
import java.util.List;
import org.apache.lucene.queryparser.flexible.core.nodes.BooleanQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.FieldQueryNode;
import org.apache.lucene.queryparser.flexible.core.nodes.QueryNode;
import org.junit.Test;
public class TestCloneTree {
@Test
public void testCloneTree() throws Exception {
QueryNode original = new BooleanQueryNode(Arrays.asList(
new FieldQueryNode(null, "a", 0, 0),
new FieldQueryNode(null, "b", 0, 0)));
sanityCheckQueryTree(original);
QueryNode cloned = original.cloneTree();
sanityCheckQueryTree(cloned);
}
private void sanityCheckQueryTree(QueryNode node) {
List<QueryNode> children = node.getChildren();
if (children != null) {
for (QueryNode child : children) {
// Matching what Lucene is using in QueryNodeImpl itself.
//noinspection ObjectEquality
if (child.getParent() != node) {
throw new IllegalStateException("Sanity check failed for
child: " + child + '\n' +
" Parent is: " +
child.getParent() + '\n' +
" But we got to it via: "
+ node);
}
sanityCheckQueryTree(child);
}
}
}
}
{code}
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