Cassandra Targett created SOLR-15482:
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Summary: Cross-collection join when document is missing from field
throws NPE
Key: SOLR-15482
URL: https://issues.apache.org/jira/browse/SOLR-15482
Project: Solr
Issue Type: Bug
Security Level: Public (Default Security Level. Issues are Public)
Components: query parsers
Reporter: Cassandra Targett
When using {{method=crossCollection}} in a Join query, if a document does not
have the field used for the {{from}} param, a NullPointerException is thrown.
This is pretty simple to reproduce using the techproducts sample data
(following assumes a clean install):
{code}
$ ./bin/solr start -e cloud -noprompt
$ ./bin/post -c gettingstarted example/exampledocs/*.xml
$ curl 'http://localhost:8983/solr/gettingstarted/select' -F 'q={!join
method="crossCollection" from=manu_id_s to=manu_id_s
fromIndex=gettingstarted}*:*'
{
"responseHeader":{
"zkConnected":true,
"status":500,
"QTime":335,
"params":{
"q":"{!join method=\"crossCollection\" from=manu_id_s to=manu_id_s
fromIndex=gettingstarted}*:*"}},
"error":{
"metadata":[
"error-class","org.apache.solr.client.solrj.impl.BaseHttpSolrClient$RemoteSolrException",
"root-error-class","org.apache.solr.client.solrj.impl.BaseHttpSolrClient$RemoteSolrException"],
"msg":"Error from server at null: java.lang.NullPointerException\n\tat
org.apache.solr.schema.FieldType.readableToIndexed(FieldType.java:419)...
{code}
Depending on which shard the error comes from, you might see a "No live
SolrServers available to handle this request" error, but digging into the logs
for the other shard that served the query will show the same NPE in the example
above (I'll put a full stack trace into a comment).
"Regular" (non-cross-collection) joins work fine if some documents are missing
the field.
If we shouldn't expect XCJF to work when documents are missing the {{from}}
field, then we should document that as a limitation and also throw a more
descriptive error.
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