HIVE Row_Sequence 实现列自增长

HIVE Row_Sequence 实现列自增长

package org.rowsequence;

/**
* UDFRowSequence.
*/
@Description(name = "row_sequence",
value = "_FUNC_() - Returns a generated row sequence number starting from 1")
@UDFType(deterministic = false)
public class RowSequence extends UDF {
private LongWritable result = new LongWritable();

public RowSequence() {
result.set(0);
}

public LongWritable eva luate() {
result.set(result.get() + 1);
return result;
}
}

add jar /home/hadoop/hive_study/hive_udf/hive_udf.jar

create temporary function row_sequence as 'org.rowsequence.RowSequence';

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