Serverless SQL pool query returns NULL for column values

Question

Hi ,

I have enabled analytical store for my cosmos DB , and trying to create views for the tables in Serverless SQL pool. When I query some table via synapse , It returns NULL for some columns. But I am sure that those columns exist with values in COSMOS DB

Please help to understand/resolve this ASAP

Thanks
Mahesh

Answer 1

Hello @Mahesh Raja Mahalingam ,
Thanks for the question and using MS Q&A platform.

As per the repro from our end , we are able to get the Not NULL data according to the sample data provided above.

If you rename a property, in one or many documents, it will be considered a new column. If you execute the same rename in all documents in the collection, all data will be migrated to the new column and the old column will be represented with NULL values.

For more details, refer to What is Azure Cosmos DB analytical store?

Hope this will help. Please let us know if any further queries.

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Answer 2

Hi,

I am facing the same issue but in our case the Type of the column has been changed. We have not renamed the column but still the column value is null in synapse. In this case which column name we should refer since the old column and new column has same name.

It would be great if anyone could give me a solution for this.

Thank you in advance.

Regards,

Anup