Why use KeyExtractor here? How about remove it?

Please see the following script:
setResults = cache.entrySet(new AndFilter(
new LikeFilter(new KeyExtractor("getLastName"), "S%",
(char) 0, false),
new EqualsFilter("getHomeAddress.getState", "MA")));Why use KeyExtractor here? How about remove it and make it like:
setResults = cache.entrySet(new AndFilter(
new LikeFilter("getLastName"), "S%"),
new EqualsFilter("getHomeAddress.getState", "MA")));Is this scrip right?
Edited by: jetq on Oct 23, 2009 2:08 PM

I Googled for KeyExtractor and the likeliest-looking thing was javadocs for com.tangosol.util.extractor.KeyExtractor on an Oracle site.
Why don't you check around the Oracle developer site for a forum specifically about whatever product this is?

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