PerFieldCodecWrapper causes crashes if not all per field codes have been used
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Key: LUCENE-2740
URL: https://issues.apache.org/jira/browse/LUCENE-2740
Project: Lucene - Java
Issue Type: Bug
Affects Versions: 4.0
Reporter: Simon Willnauer
Fix For: 4.0
If a PerFieldCodecWrapper is used an SegmentMerger tries to merge two segments
where one segment only has a subset of the field PerFieldCodecWrapper defines
SegmentMerger tries to open non-existing files since Codec#files(Directory,
SegmentInfo, Set<String>) blindly copies the expected files into the given set.
This also hits exceptions in CheckIndex and addIndexes().
The reason for this is that PerFieldCodecWrapper simply iterates over the
codecs it knows and adds all files without checking if they are present in the
given Directory. We need to have some mechnanism that check if the "required"
files for a codec are present and only add the files to the set if that field
is really there.
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