ChrisHegarty commented on PR #16418:
URL: https://github.com/apache/lucene/pull/16418#issuecomment-5103105025
One thought for the future: the feature is all-or-nothing across the index
today. In practice some fields are read-heavy (sorting, aggregations) and would
benefit from a flat dense column, while others are write-heavy and would prefer
cheap sparse deltas. A per-field policy could be a nice follow-up. The plumbing
already knows which field is being updated, so it should be straightforward to
add later. Something like:
```
IndexWriterConfig.setMaxDocValuesDeltaGenerations("score", 16); // sparse
deltas for this field
IndexWriterConfig.setMaxDocValuesDeltaGenerations("timestamp", 0); // dense
rewrite for this field
```
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