Ronald S. Wood created SOLR-9437:
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Summary: Add schema property useDocValues to control use of
docValues at query time
Key: SOLR-9437
URL: https://issues.apache.org/jira/browse/SOLR-9437
Project: Solr
Issue Type: Improvement
Security Level: Public (Default Security Level. Issues are Public)
Affects Versions: 5.5.2
Reporter: Ronald S. Wood
Currently migration to docValues appears to be an all or nothing proposition,
requiring a full reindexing when an existing field with indexed records gets
docValues set to true. This can be a painful process for users with very large
indexes.
If a new schema property called useDocValues is created (with a default of
true), this can be used to allow incremental re-indexing of records.
The idea is that while docValues=true indexing docValues will happen as before,
but as long as useDocValues=false, the partially indexed docValues will not be
used so that searches, faceting, etc. will behave as if docValues=false.
Once the user is satisfied that all records have docValues, they can set
useDocValues=true or remove the property altogether.
>From what I can see in the Solr core code, where field.hasDocValues is now
>used to determine whether to use docValues at query time, the code can be
>changed to (field.hasDocValues && field.useDocValues).
I am uncertain whether any changes would be needed at the Lucene level.
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