Key fields must be top-level

Symptom

I used a joiner to enrich one data stream with data from another. However, even though my key fields were at the top of their respective column list, I have got the error "key fields must be top-level".

Cause

Not identically named fields as key fields.

Solution

Make sure, you name join attributes/fields identically. It is matching over names.

Remark

The error message is somewhat misleading as it was just unable to find matching attribute independently from the position, the were at.

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