So I dug into this a bit further, and find it happens with the stock
Lucene query as well, in 4.10.2. I looked at the code on trunk, and I
don't think the situation is different there. Basically if you delete a
parent document, orphaning some child document(s) and then merge, the
TPBJQuery fails with an exception if the orphaned docs are matched. I
feel like this is pretty surprising, and it's not that hard to do
something more expected; the orphaned children can just be skipped by
testing for this condition (instead of just asserting the contrary, as
we do now).
If some committer speaks up and agrees, I'll at least open an issue.
-Mike
On 2/5/2015 12:02 PM, Michael Sokolov wrote:
I've run into an exception, and I'm trying to understand whether it is
something that can just happen if the index doesn't conform to the
expectations of the TPBJQ, or if I've somehow messed things up in my
extension of that query.
The exception I'm seeing is in BlockJoinScorer.nextDoc(). It's clear
that the assertion below is being contravened; No parentDoc is found
for some child doc.
// Gather all children sharing the same parent as
// nextChildDoc
parentDoc = parentBits.nextSetBit(nextChildDoc);
assert parentDoc != -1;
//System.out.println(" nextChildDoc=" + nextChildDoc);
if (
// parentDoc = -1 shouldn't happen, but it did. I'm not sure
// if this is a consequence of our allowing parents to be a
// child -- I don't think so -- it seems more likely the
index
// can just get in a state where there are children with no
// parent, and that could cause this?
parentDoc == -1 ||
(acceptDocs != null && !acceptDocs.get(parentDoc))
) {
// Parent doc not accepted; skip child docs until
// we hit a new parent doc:
do {
nextChildDoc = childScorer.nextDoc();
} while (nextChildDoc <= parentDoc);
What I'm wondering is why we believe that assertion? Is there
something that guarantees the state of the index beyond the user
having indexed their documents correctly?
I'm concerned that a change I made to the query may be causing this,
but I can't see how. What I did is to allow a parent doc to also be a
child doc, and I also passed acceptDocs when creating the childScorer,
so that child docs are filtered by the prevailing filter, as well as
parent docs.
Any pointers or ideas welcome ! Thanks
-Mike
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