mongodb debezium schema builder issue

[רום כהן‎]

Hi

we are trying to stream data from mongo source, our messages looks as follows:
{
    _id: 1,

    guests: [

        {

              name: "john",

              features: [

                  {

                       a: "some_string"

                  }

              ]
        },

        {

              name: "doe",

              features: []

        }

    ]

}

As you can see, the "features" sub-array is of type struct. However, when we try to CDC on this document, debezium crashes with the following error:

org.apache.kafka.connect.errors.DataException: Not a struct schema: Schema{STRING}

From my testing, I was able to see that the crash happpens when at least one element is populated and at least one is empty.
I suspect that this issue arises because the MongoDataConverter can't correctly parse arrays of type struct when one of the elements is empty.

[Anisha Mohanty]

Hi,

Which debezium version are you using and what is the encoding mode?

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[רום כהן‎]

We tried using v3.2.0 and 3.3.0 snapshot, encoding mode array.

ב-יום שני, 11 באוגוסט 2025 בשעה 07:47:48 UTC+3, anmo...@redhat.com כתב/ה:

[רום כהן‎]

HI
any update?

ב-יום שני, 11 באוגוסט 2025 בשעה 09:53:35 UTC+3, רום כהן כתב/ה: