Actually my condition same with this thread but when I try, it doesn't work for me.
When querying for data, there are situations where the returned data-set is empty for certain time ranges. Such a situation occurred in Vega (returned an empty array) and I tried to create a condition using expressions to check if the data-set is empty but it doesn't seem to work.
length(data('table')) == 0 ? '-' : datum.sum
Adding the above test condition in a formula transform says Undefined data set name: "table". Nothing seems to change when it is used inside a mark as a signal for a field.…
I did the filter transform and when there's no rows that shown after the transform, I want to make a static text to inform that.
system
March 6, 2023, 6:39am
2
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