LUCENE-9578: TermRangeQuery empty string lower bound edge case #1976
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Currently a TermRangeQuery with the empty String ("") as lower bound and
includeLower=false leads internally constructs an Automaton that doesn't match
anything. This is unexpected expecially for open upper bounds where any string
should be considered to be "higher" than the empty string.
This PR changes "Automata#makeBinaryInterval" so that for an empty string lower
bound and an open upper bound, any String should match the query regardless or
the includeLower flag.
jpountz
reviewed
Oct 12, 2020
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@jpountz thanks for the review, I added a commit that rejects the empty string when "includeMin == false" and added tests for that edge case as well. |
jpountz
reviewed
Oct 14, 2020
lucene/core/src/java/org/apache/lucene/util/automaton/Automata.java
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@jpountz thanks for the review, I added another commit that should fix the problem you detected. |
jpountz
reviewed
Oct 15, 2020
| * Returns a new (deterministic) automaton that accepts all binary terms except | ||
| * the empty string. | ||
| */ | ||
| public static Automaton makeAnyBinaryExceptEmpty() { |
Contributor
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Maybe call makeNonEmptyBinary?
Contributor
|
I had a deeper look to check whether this could be an indicator of other bugs lurking, but it doesn't seem so and the fix looks good to me. For reference here's what the automaton looks like today with an empty string as a min bound and includeMin==false before the above fix. |
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|
@jpountz thanks, I renamed the method. btw. would this change also be backported to the latest 8.7 branch so we can use it in ES to fix elastic/elasticsearch#63386? |
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The 8.7 branch has not been cut yet so this will be in 8.7. This change looked safe to me so I felt free to merge in spite of the branch being imminently cut. |
jpountz
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Oct 16, 2020
Currently a TermRangeQuery with the empty String ("") as lower bound and
includeLower=false leads internally constructs an Automaton that doesn't match
anything. This is unexpected expecially for open upper bounds where any string
should be considered to be "higher" than the empty string.
This PR changes "Automata#makeBinaryInterval" so that for an empty string lower
bound and an open upper bound, any String should match the query regardless or
the includeLower flag.
asfgit
pushed a commit
that referenced
this pull request
Oct 26, 2020
Currently a TermRangeQuery with the empty String ("") as lower bound and
includeLower=false leads internally constructs an Automaton that doesn't match
anything. This is unexpected expecially for open upper bounds where any string
should be considered to be "higher" than the empty string.
This PR changes "Automata#makeBinaryInterval" so that for an empty string lower
bound and an open upper bound, any String should match the query regardless or
the includeLower flag.
msfroh
pushed a commit
to msfroh/lucene-solr
that referenced
this pull request
Nov 18, 2020
…e#1976) Currently a TermRangeQuery with the empty String ("") as lower bound and includeLower=false leads internally constructs an Automaton that doesn't match anything. This is unexpected expecially for open upper bounds where any string should be considered to be "higher" than the empty string. This PR changes "Automata#makeBinaryInterval" so that for an empty string lower bound and an open upper bound, any String should match the query regardless or the includeLower flag.
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Description
Currently a TermRangeQuery with the empty String ("") as lower bound and
includeLower=false leads internally constructs an Automaton that doesn't match
anything. This is unexpected expecially for open upper bounds where any string
should be considered to be "higher" than the empty string.
Solution
This PR changes "Automata#makeBinaryInterval" so that for an empty string lower
bound and an open upper bound, any String should match the query regardless or
the includeLower flag.
Tests
Added two new tests to
TestAutomaton.Checklist
Please review the following and check all that apply:
masterbranch../gradlew check