Azure Log Analytics for Postgres Flexible Server - postgresql

Question

Just trying to use a pre-existing "Slowest queries - top 5" from Azure log analytics for postgres flexible server. The query that is provided is:
// Slowest queries
// Identify top 5 slowest queries.
AzureDiagnostics
| where ResourceProvider == "MICROSOFT.DBFORPOSTGRESQL"
| where Category == "QueryStoreRuntimeStatistics"
| where user_id_s != "10" //exclude azure system user
| summarize avg(todouble(mean_time_s)) by event_class_s , db_id_s ,query_id_s
| top 5 by avg_mean_time_s desc
This query results in the error :
'where' operator: Failed to resolve column or scalar expression named 'user_id_s'
If the issue persists, please open a support ticket. Request id: XXXX
I am guessing that something is not configured in order to utilize the user_id_s column. Any assistance is appreciated.

Answer 1

I am expecting you are checking the integer value 10 is not equal to the user_id_s.
In your KQL query user_id_s != "10" .
Thanks # venkateshdodda-msft I am adding your suggestion to help to fix the issue.
If you are using integer in a KQL make sure to remove the " " double quotes.
# using as a integer
| where user_id_s != 10
Or convert the integer into string by using
# converting into string
| extend user_id_s = tostring(Properties.user_id_s)
| where UserId in ('10')
Modified KQL Query
AzureDiagnostics
| where ResourceProvider == "MICROSOFT.DBFORPOSTGRESQL"
| where Category == "QueryStoreRuntimeStatistics"
# using as a integer
| where user_id_s != 10 //exclude azure system user
| summarize avg(todouble(mean_time_s)) by event_class_s , db_id_s ,query_id_s
| top 5 by avg_mean_time_s desc
Reference:
Operator failed to resolve table or column expression
Converting integer to string