Optimization of EquatableList<T>
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Key: LUCENENET-292
URL: https://issues.apache.org/jira/browse/LUCENENET-292
Project: Lucene.Net
Issue Type: Improvement
Reporter: Nicholas Paldino
Priority: Minor
When comparing two IEnumerable<T> implementations, a shortcut can be taken to
check to see if both IEnumerable<T> expose operations which returns a count of
items (sequences cannot be equal if the number of elements in the sequences are
not equal).
Typically, in .NET, this is expressed through the implementation of the
ICollection or ICollection<T> interface.
Before enumerating through each element and comparing the two for equality, if
the counts are accessible, they should be compared to see if the number of
elements in the two sequences are equal. If a comparison is able to be made
before enumerating, it will be much more performant for comparisons of
sequences where each is ~N, but both are not equal to N, and N is very large.
Patch to follow.
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