sealed trait UDTF extends Serializable

The Scala UDTF (user-defined table function) trait.

Since

1.2.0

Linear Supertypes
Serializable , AnyRef , Any
Known Subclasses
UDTF0 , UDTF1 , UDTF10 , UDTF11 , UDTF12 , UDTF13 , UDTF14 , UDTF15 , UDTF16 , UDTF17 , UDTF18 , UDTF19 , UDTF2 , UDTF20 , UDTF21 , UDTF22 , UDTF3 , UDTF4 , UDTF5 , UDTF6 , UDTF7 , UDTF8 , UDTF9
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  1. abstract def endPartition () : Iterable [ Row ]

    This method can be used to generate output rows that are based on any state information aggregated in process().

    This method can be used to generate output rows that are based on any state information aggregated in process(). This method is invoked once for each partition, after all rows in that partition have been passed to process().

    The rows returned in this method must match the StructType defined in outputSchema

    Since: 1.2.0

  2. abstract def outputSchema () : StructType

    A StructType that describes the data types of the fields in the rows returned by the process() and endPartition() methods.

    A StructType that describes the data types of the fields in the rows returned by the process() and endPartition() methods.

    For example, if a UDTF returns rows that contain a StringType and IntegerType field, the outputSchema() method should construct and return the following StructType object: {{ override def outputSchema(): StructType = StructType(StructField("word", StringType), StructField("count", IntegerType)) }}

    Since: 1.2.0

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    (Since version ) see corresponding Javadoc for more information.

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