Robert Muir created LUCENE-7419:
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Summary: performance bug in tokenstream.end()
Key: LUCENE-7419
URL: https://issues.apache.org/jira/browse/LUCENE-7419
Project: Lucene - Core
Issue Type: Bug
Reporter: Robert Muir
TokenStream.end() calls getAttribute(), which is pretty costly to do per-stream.
It does its current hack, because in the ctor of TokenStream is "too early".
Instead, we can just add a variant of clear(), called end() to AttributeImpl.
For most attributes it defers to clear, but for PosIncAtt it can handle the
special case.
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