Julie Tibshirani created LUCENE-10228:
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Summary: PerFieldKnnVectorsFormat
Key: LUCENE-10228
URL: https://issues.apache.org/jira/browse/LUCENE-10228
Project: Lucene - Core
Issue Type: Bug
Reporter: Julie Tibshirani
Currently when creating a KnnVectorsWriter for merging, we consult the existing
"PER_FIELD_SUFFIX_KEY" attribute to determine the format's per-field suffix.
This isn't correct since we could be using a new codec (that produces different
formats/ suffixes).
The attached PR modifies TestPerFieldDocValuesFormat#testMergeUsesNewFormat to
trigger the problem. Without the fix we get an error like
"java.nio.file.FileAlreadyExistsException: File
"_3_Lucene90HnswVectorsFormat_0.vem" was already written to."
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