Module udf::traits

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Expand description

Module containing traits to be implemented by a user

A basic UDF just needs to implement BasicUdf. An aggregate UDF needs to implement both BasicUdf and AggregateUdf.

Structs

  • Init
    Typestate marker for the initialization phase
  • Process
    Typestate marker for the processing phase

Traits

  • AggregateUdf
    This trait must be implemented if this function performs aggregation.
  • BasicUdf
    This trait specifies the functions needed for a standard (non-aggregate) UDF
  • UdfState
    A state of the UDF, representing either Init or Process