Add a Dummy Row for Each Row in the Table

问题

I have below query which returns %CPU of each Computer by every 1 hour

Query

Perf
| where TimeGenerated > ago(1h) 
| where CounterName == "% Processor Time" 
| where Computer endswith "XYZ" 
| summarize avg(CounterValue) by bin(TimeGenerated, 1h), Computer 

Result

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I want to append Dummy row for each-row in the table with fixed value except TimeGenerated should be same as previous row in the table. Expecting result should look something like this.

Expected Result

回答1:

you could try something like this (note that you'll need to explicitly order your records as you wish):

let T = 
    Perf
    | where TimeGenerated > ago(1h) 
    | where CounterName == "% Processor Time" 
    | where Computer endswith "XYZ" 
    | summarize avg(CounterValue) by bin(TimeGenerated, 1h), Computer
;
T
| union (T | extend Computer = "Dummy", avg_CounterValue = 10)
| order by TimeGenerated

来源：https://stackoverflow.com/questions/61766644/add-a-dummy-row-for-each-row-in-the-table