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https://issues.apache.org/jira/browse/LUCENE-7491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15568327#comment-15568327
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Michael McCandless commented on LUCENE-7491:
--------------------------------------------

bq. we could have LeafReader.getPointValues(String fieldName) and remove all 
String fieldName parameters from PointValues?

I think that's compelling!  Maybe open a new issue?

But would this API return null if that field did not index points in that 
segment?

> Unexpected merge exception when merging sparse points fields
> ------------------------------------------------------------
>
>                 Key: LUCENE-7491
>                 URL: https://issues.apache.org/jira/browse/LUCENE-7491
>             Project: Lucene - Core
>          Issue Type: Bug
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: master (7.0), 6.3
>
>         Attachments: LUCENE-7491.patch, LUCENE-7491.patch
>
>
> Spinoff from this user thread: http://markmail.org/thread/vwdvjgupyz6heep5
> If you have a segment that has points, but a given field ("id") didn't index 
> points, and a later segment where field "id" does index points, when try to 
> merge those segments we hit this (incorrect!) exception:
> {noformat}
> Caused by: org.apache.lucene.index.MergePolicy$MergeException: 
> java.lang.IllegalArgumentException: field="id" did not index point values
>       at __randomizedtesting.SeedInfo.seed([9F3E7B030EF482BD]:0)
>       at 
> org.apache.lucene.index.ConcurrentMergeScheduler.handleMergeException(ConcurrentMergeScheduler.java:668)
>       at 
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:648)
> Caused by: java.lang.IllegalArgumentException: field="id" did not index point 
> values
>       at 
> org.apache.lucene.codecs.lucene60.Lucene60PointsReader.getBKDReader(Lucene60PointsReader.java:126)
>       at 
> org.apache.lucene.codecs.lucene60.Lucene60PointsReader.size(Lucene60PointsReader.java:224)
>       at 
> org.apache.lucene.codecs.lucene60.Lucene60PointsWriter.merge(Lucene60PointsWriter.java:169)
>       at 
> org.apache.lucene.index.SegmentMerger.mergePoints(SegmentMerger.java:173)
>       at org.apache.lucene.index.SegmentMerger.merge(SegmentMerger.java:122)
>       at 
> org.apache.lucene.index.IndexWriter.mergeMiddle(IndexWriter.java:4287)
>       at org.apache.lucene.index.IndexWriter.merge(IndexWriter.java:3864)
>       at 
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(ConcurrentMergeScheduler.java:588)
>       at 
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run(ConcurrentMergeScheduler.java:626)
> {noformat}



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