make_set_if() (aggregation function)
Creates a dynamic array of the set of distinct values that expr takes in records for which predicate evaluates to true.
Null values are ignored and don't factor into the calculation.
Note
This function is used in conjunction with the summarize operator.
Syntax
make_set_if(expr, predicate [, maxSize])
Learn more about syntax conventions.
Parameters
| Name | Type | Required | Description |
|---|---|---|---|
| expr | string |
✔️ | The expression used for the aggregation calculation. |
| predicate | string |
✔️ | A predicate that has to evaluate to true in order for expr to be added to the result. |
| maxSize | int |
The maximum number of elements returned. The default and max value is 1048576. |
Returns
Returns a dynamic array of the set of distinct values that expr takes in records for which predicate evaluates to true. The array's sort order is undefined.
Tip
To only count the distinct values, use dcountif().
Related content
make_set function, which does the same, without predicate expression.
Example
The following example shows a list of names with more than 4 letters.
let T = datatable(name:string, day_of_birth:long)
[
"John", 9,
"Paul", 18,
"George", 25,
"Ringo", 7
];
T
| summarize make_set_if(name, strlen(name) > 4)
Output
| set_name |
|---|
| ["George", "Ringo"] |