How to specify which columns to use when using DLT APPLY CHANGES INTO

Data Engineering

Join discussions on data engineering best practices, architectures, and optimization strategies within the Databricks Community. Exchange insights and solutions with fellow data engineers.

I have a notebook with the code below, where I try to do an upsert into a dimension table and only include one column from the source table. I get an error even though I think the syntax matches what I see in the docs. How can I write this in the correct way?

CREATE OR REFRESH LIVE TABLE D_AzureResourceType_DLT
(
  WkAzureResourceType bigint GENERATED ALWAYS AS IDENTITY,
  ConsumedService string NOT NULL
);
 
APPLY CHANGES INTO
  LIVE.D_AzureResourceType_DLT
FROM
  STREAM(LIVE.AzureCost)
KEYS
  (ConsumedService)
SEQUENCE BY
  Date
COLUMNS (ConsumedService);

Currently, the "Initializing" step in the Delta Live Tables workflow fails with this error: