THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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| UDF | UDAF | UDTF |
|---|---|---|
| It is a function that receives only a single row as an input and returns a single row as an output. Like: length, or round functionsExtend class: UDF org.apache.hadoop.hive.ql.exec.UDF; | It is a function that receives multiple rows as input and returns a single row as output. Like: Count, Min, Max | It is a function that receives a single row as input and returns multiple rows - result set or table - as output. |
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