package brickhouse.udf.sketch;
import org.apache.hadoop.hive.ql.exec.Description;
import org.apache.hadoop.hive.ql.exec.UDF;
import com.google.common.hash.HashCode;
import com.google.common.hash.HashFunction;
import com.google.common.hash.Hashing;
/**
* Calculate the MD5 hash for a String.
*
* Useful for sketching ...
* @author jeromebanks
*
*/
@Description(name="hash_md5",
value = "_FUNC_(x) - Hash MD5. "
)
public class HashMD5UDF extends UDF {
private HashFunction hash = Hashing.md5();
public Long evaluate( String str) {
HashCode hc = hash.hashUnencodedChars( str);
return hc.asLong();
}
}