Konstantin Gribov created SOLR-7835:
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Summary: solr.schema.FieldType#createFields has incorrect check
for absent docValues
Key: SOLR-7835
URL: https://issues.apache.org/jira/browse/SOLR-7835
Project: Solr
Issue Type: Bug
Components: Schema and Analysis
Affects Versions: 5.2.1
Reporter: Konstantin Gribov
Priority: Minor
{{lucene.document.FieldType#docValuesType()}} call always return non-null
result which is protected by setter and copy constructor.
This method is used in {{solr.schema.FieldType#createFields(...)}} to enforce
valid docValues type for field with {{docValues="true"}} in schema.
Current check is incorrect since it compares {{docValuesType}} to {{null}}
which is always false.
In case of incorrectly implemented Solr FieldType which overrides
{{checkSchemaField(...)}} to allow docValues and doesn't override
{{createFields(...)}} it leads to buggy behavior: user thinks that field use
docValues (since it's set in schema.xml and solr doesn't indicates any error),
but really {{UninvertingReader}} with {{fieldValuesCache}} is used for
faceting, grouping etc.
This issue is only present when user creates his own {{solr.schema.FieldType}}
implementation because Solr FieldTypes which don't support docValues do not
override {{checkSchemaField(...)}} method.
I will push pull request with patch and test case in several minutes.
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