#3 ClassCastException when using MultiSearcher

[Robert Watts]

First of all; great work.

I've noticed a problem when trying to run TestDistance.testRange over a MultiSearcher, which is what we use (don't ask).

To recreate replace the first line in testRange():

searcher = new IndexSearcher(directory);

with

MultiSearcher searcher = new MultiSearcher(new Searchable[] { new IndexSearcher(directory) });

and the ClassCastException is thrown on FieldDocSortedHitQueue when it tries to cast the double into a float (which DistanceSortSource.DistanceScoreDocLookupComparator uses at its sortType).

This is happening during the merge sort that MultiSearcher does after every query - this would not have been picked up using a standard IndexSearcher.

[Robert Watts]

DistanceSortSource

[Robert Watts]

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I have a resolution.

sortValue in DistanceSortSource.DistanceScoreDocLookupComparator was returning a double, hence causing the ClassCastException.

I've attached a patch.
File Added: DistanceSortSource.java

[Nobody/Anonymous]

Logged In: NO

I got the same problem too. The workaround is to modify DistanceSortSource.java to return 7 :
public int sortType() {
//return SortField.FLOAT;
//return SortField.DOUBLE; - SortField.java needs to add this constant
return 7; // SortField.DOUBLE;
}