TermSpans skipTo() doesn't always move forwards
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Key: LUCENE-1327
URL: https://issues.apache.org/jira/browse/LUCENE-1327
Project: Lucene - Java
Issue Type: Bug
Components: Query/Scoring, Search
Affects Versions: 2.3.1, 2.3, 2.2, 2.1, 2.0.0, 1.9, 2.3.2, 2.4, 2.9, 3.0
Reporter: Moti Nisenson
Fix For: 2.3.2, 2.4, 2.9, 3.0, 2.3.1, 2.3, 2.2, 2.1, 2.0.0, 1.9
In TermSpans (or the anonymous Spans class returned by SpansTermQuery,
depending on the version), the skipTo() method is improperly implemented if the
target doc is less than or equal to the current doc:
public boolean skipTo(int target) throws IOException {
// are we already at the correct position?
if (doc >= target) {
return true;
}
...
This violates the correct behavior (as described in the Spans interface
documentation), that skipTo() should always move forwards, in other words the
correct implementation would be:
if (doc >= target) {
return next();
}
This bug causes particular problems if one wants to use the payloads feature -
this is because if one loads a payload, then performs a skipTo() to the same
document, then tries to load the "next" payload, the spans hasn't changed
position and it attempts to load the same payload again (which is an error).
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