[jira] [Created] (SOLR-9224) Nested objects for multilevel nesting

["Alexey Vasyukov (JIRA)" <ji...@apache.org>]

Alexey Vasyukov created SOLR-9224:
-------------------------------------

             Summary: Nested objects for multilevel nesting
                 Key: SOLR-9224
                 URL: https://issues.apache.org/jira/browse/SOLR-9224
             Project: Solr
          Issue Type: Bug
    Affects Versions: 6.1, 5.5.1
            Reporter: Alexey Vasyukov


I observe quite strange behaviour for multi-level nesting of SOLR objects using both SOLR 5.5.1 and SOLR 6.1.0 (SOLR Cloud to be specific, if it's important).

I consider it to be a SOLR bug. However, my experience with nested objects is limited, so, I'd really appreciate any review from more experienced folks. The steps to reproduce the issue:

1. Start clean SOLR instance and create test collection:
{code}
./bin/solr start -e cloud -noprompt
./bin/solr create_collection -c qa -shards 2 -p 8983
{code}

2. Upload test data:
{code}
    <doc>
        <field name="id">CONTAINER_1</field>
        <field name="title">CONTAINER</field>
        <doc>
            <field name="id">CONTAINER_1_ITEM</field>
            <field name="title">META</field>
        </doc>
        <doc>
            <field name="id">CONTAINER_1_PERSON</field>
            <field name="title">META</field>
        </doc>
        <doc>
            <field name="id">DOC_1</field>
            <field name="title">DOCUMENT</field>
            <doc>
                <field name="id">DOC_1_ITEM</field>
                <field name="title">META</field>
            </doc>
            <doc>
                <field name="id">DOC_1_PERSON</field>
                <field name="title">META</field>
            </doc>
        </doc>
        <doc>
            <field name="id">DOC_2</field>
            <field name="title">DOCUMENT</field>
            <doc>
                <field name="id">DOC_2_ITEM</field>
                <field name="title">META</field>
            </doc>
            <doc>
                <field name="id">DOC_2_PERSON</field>
                <field name="title">META</field>
            </doc>
        </doc>
    </doc>
{code}

3. Query for:
{code}
{!child of=title:DOCUMENT}id:DOC_2
{code}

Everything works as expected, there are 2 docs in the response:
{code}
    [
      {
        "id":"DOC_2_ITEM",
        "title":["META"]},
      {
        "id":"DOC_2_PERSON",
        "title":["META"]}
    ]
{code}

4. Query for:
{code}
{!child of=title:DOCUMENT}id:DOC_1
{code}

See strange response with 4 docs instead of 2:
{code}
    [
      {
        "id":"CONTAINER_1_ITEM",
        "title":["META"]},
      {
        "id":"CONTAINER_1_PERSON",
        "title":["META"]},
      {
        "id":"DOC_1_ITEM",
        "title":["META"]},
      {
        "id":"DOC_1_PERSON",
        "title":["META"]}
    ]
{code}

Any ideas on what is wrong? Any ideas regarding possible workaround?

I'm absolutely positive about debugging-fixing-contributing myself, but I really need initial entry points for digging into SOLR sources.



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