Shad Storhaug created LUCENE-8001:
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Summary: UnescapedCharSequence Bugs
Key: LUCENE-8001
URL: https://issues.apache.org/jira/browse/LUCENE-8001
Project: Lucene - Core
Issue Type: Bug
Components: core/queryparser
Affects Versions: 7.1
Reporter: Shad Storhaug
Priority: Minor
There are a couple of issues with UnescapedCharSequence:
1. The [private
constructor|https://github.com/apache/lucene-solr/blob/32ed8520c706a865b94e03644ae4e4435e0f7d35/lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/core/util/UnescapedCharSequence.java#L52-L63]
is not used anywhere (and if it were, it would throw exceptions)
2. The ToEscapedString() overload has an [invalid
condition|https://github.com/apache/lucene-solr/blob/32ed8520c706a865b94e03644ae4e4435e0f7d35/lucene/queryparser/src/java/org/apache/lucene/queryparser/flexible/core/util/UnescapedCharSequence.java#L96]
that will only evaluate to true if the string has a length of 0.
There are no tests for UnescapedCharSequence so these issues have gone
unnoticed for quite some time.
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