Append query not working and give stack overflow error

[akasthan]

Hello

I am try to append two datesets obtained from Kusto into one and facing an stack overflow error.

Just to test this, kept only 1 entry in data set and kept the columns same but still getting the same error.

Dataset Query1: 

Query2:

Append Error:

Copied the same data in 2 excels and append query works there. Looks like the issue occurs when the dataset is pulled from Kusto. 

Sample Kusto query
ClientEventLog
| where env_time >= ago(1d)
| where ClientPage has "somepage"
| project TenantId, Page
| take 10

Does anyone knows what could be the reason behind it?

[v-kkf-msft · Accepted solution]

Hi @akasthan ,

There is a known issue about appending data from Kusto into power bi based on my search(ICM: 219724212).

From the information collected by PG, the best workaround for this is probably to call Table.AddIndexColumn on the Kusto data before using Table.Combine.

The main advantage of Table.AddIndexColumn is that it can be used by someone through the UI without any typing.

If the problem is still not resolved, please provide detailed error information or the expected result you expect. Let me know immediately, looking forward to your reply.
Best Regards,
Winniz
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[akasthan]

Thanks a lot @v-kkf-msft, this works.

Although I went ahead with the alternative approach of taking union in Kusto itself before pulling the data in PowerBI.

let query1 = ClientEventLog
| where env_time >= ago(1d)
| where ClientPage has "somepage"
| project TenantId, Page
| take 10;
let query2 = ClientEventLog
| where env_time >= ago(1d)
| where ClientPage has "somepage2"
| project TenantId, Page
| take 10;
query1 | union query2;