package brickhouse.udf.bloom;
/**
* Copyright 2012 Klout, Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**/
import java.io.IOException;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import org.apache.hadoop.util.bloom.Filter;
@Description(
name = "bloom_and",
value = " Returns the logical AND of two bloom filters; representing the intersection of values in both bloom1 AND bloom2 \n " +
"_FUNC_(string bloom1, string bloom2) "
)
public class BloomAndUDF extends UDF {
public String evaluate( String bloom1Str, String bloom2Str ) throws IOException {
Filter bloom1 = BloomFactory.GetBloomFilter( bloom1Str);
Filter bloom2 = BloomFactory.GetBloomFilter( bloom2Str);
bloom1.and( bloom2);
return BloomFactory.WriteBloomToString( bloom1);
}
}