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https://issues.apache.org/jira/browse/SOLR-18496?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ASF GitHub Bot updated SOLR-18496:
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Labels: pull-request-available (was: )
> Single-pass distributed query fails with an NPE when the unique key is
> renamed in fl
> ------------------------------------------------------------------------------------
>
> Key: SOLR-18496
> URL: https://issues.apache.org/jira/browse/SOLR-18496
> Project: Solr
> Issue Type: Bug
> Reporter: Serhiy Bzhezytskyy
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> With {{distrib.singlePass=true}}, a non-grouped distributed query whose
> {{fl}} renames the unique key without also requesting it fails with HTTP 500.
> The two-pass path (SOLR-6744) and grouped queries (SOLR-15273) handle the
> rename; the single-pass merge in {{QueryComponent.mergeIds}} does not, and
> {{CombinedQueryComponent.mergeIds}} has the same lookup.
> To reproduce (SolrCloud, two shards):
> {code:bash}
> bin/solr start
> bin/solr create -c test --shards 2
> curl 'http://localhost:8983/solr/test/update?commit=true' -H 'Content-Type:
> application/json' -d '[{"id":"a1"},{"id":"a2"},{"id":"a3"}]'
> curl
> 'http://localhost:8983/solr/test/select?q=*:*&fl=aliasId:id&distrib.singlePass=true'
> {code}
> The response is a 500:
> {noformat}
> java.lang.NullPointerException: Cannot invoke "Object.toString()" because
> "shardDoc.id" is null
> at
> org.apache.solr.handler.component.QueryComponent$3.resultIds(QueryComponent.java:963)
> at
> org.apache.solr.handler.component.QueryComponent.setResultIdsAndResponseDocs(QueryComponent.java:1290)
> at
> org.apache.solr.handler.component.QueryComponent.mergeIds(QueryComponent.java:1234)
> {noformat}
> The same request without {{distrib.singlePass}}, or with
> {{fl=id,aliasId:id}}, returns the documents. Through the combined query
> handler, {{"fields": ["key:id"]}} together with {{"distrib.singlePass":
> true}} fails the same way in {{CombinedQueryComponent.mergeIds}}.
> In single-pass mode the shards run the original {{fl}}, so they return the
> key as {{aliasId}}, while {{mergeIds}} reads it under the schema name {{id}}
> and gets null. {{returnFields}} already reads the renamed key. The fix is to
> read the key under the name {{fl}} gave it in both {{mergeIds}}
> implementations, only for single-pass requests.
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