Problems with Data Factory 'Flatten' option

Adrian 181 Reputation points
2021-08-24T16:48:32.183+00:00

I am trying to use Flaten inside of Data Factory, I keep on getting the error

The inner value type of the 'Unroll by' structure '{Category Numbers}' must be array type (e.g. structue of arrays, array of arrays)

Whilst I just did a 'Split' operation, this is the preview of the column 'Cateogry Numbers' from the previous step.

126144-image.png

Does anybody have any idea why this is happening?

Azure Data Factory
Azure Data Factory
An Azure service for ingesting, preparing, and transforming data at scale.
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Accepted answer
  1. KranthiPakala-MSFT 46,427 Reputation points Microsoft Employee
    2021-08-25T10:26:49.703+00:00

    Hi @Adrian ,

    Thanks for using Microsoft Q&A forum and posting your query.

    We have noticed that one of our engineer has already been engaged on the same query in Stackoverflow and shared few inputs on Flatten transformation : Data Factory not recognising array for 'flatten' operation

    If you still have further queries, please do share a sample of your input/source data (pls remove sensitive information) and expected output so that we can further assist as needed.

    Thank you

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