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Support UDTF (user defined tabular functions) #1830

miguno opened this issue Sep 5, 2018 · 0 comments


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commented Sep 5, 2018

In this ticket, we want to allow KSQL users to create their own tabular functions via UDTFs, similar to the existing support for UDFs and UDAFs.

Functions such as EXPLODE (not yet supported out of the box) are examples of functions in the UDTF category. Another example is flatMap in the Kafka Streams DSL and in Scala.


What's the difference between UDF (supported since 5.0), UDAF (supported since 5.0), and UDTF?

  • UDF: user defined function (ex: SUBSTRING)
    • Takes 1 input record, produces 1 output record
  • UDAF: user defined aggregate function (ex: SUM, COUNT)
    • Takes N input records, produces 1 output record
  • UDTF (this ticket): user defined tabular function
    • Takes 1 input record, produces 0,1, or N output records

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