Azure Log Analytics查询属性是否存在

Question

我正在尝试检查我的customDimensions对象是否具有属性，然后仅计算将属性设置为某些值的查询。它正在计算SupportedLanguage对象中没有customDimensions属性的查询。

这是我当前的查询：

customEvents
| where timestamp > ago(7d)
| summarize COUNT=count(customDimensions.SupportedLanguage) by lang=tostring(customDimensions.SupportedLanguage)
| render piechart

我尝试执行以下操作，但没有成功：

customEvents
| where timestamp > ago(7d)
| where customDimensions.SupportedLanguage
| summarize COUNT=count(customDimensions.SupportedLanguage) by lang=tostring(customDimensions.SupportedLanguage)
| render piechart 

Answer 1

您可以利用isnotempty()函数来实现此目的：

customEvents
| where timestamp > ago(7d)
| where isnotempty(customDimensions.SupportedLanguage)