take_anyif() (aggregation function)
Arbitrarily selects one record for each group in a summarize operator, for which the predicate is "true". The function returns the value of an expression over each such record.
This function is useful when you want to get a sample value of one column per value of the compound group key, subject to some predicate that is "true". If such a value is present, the function attempts to return a non-null/non-empty value.
Note
anyif() is a legacy and obsolete version of the take_anyif() function. The legacy version adds any_ prefix to the columns returned by the any() aggregation.
Syntax
take_anyif ( Expr, Predicate )
Arguments
- Expr: An expression over each record selected from the input to return.
- Predicate: Predicate to indicate which records may be considered for evaluation.
Returns
The take_anyif aggregation function returns the value of the expression calculated
for each of the records randomly selected from each group of the summarize operator. Only records for which Predicate returns "true" may be selected. If the predicate doesn't return "true", a null value is produced.
Examples
Pick a random EventType from Storm events, where event description has a key phrase.
StormEvents
| summarize take_anyif(EventType, EventNarrative has 'strong wind')
| EventType |
|---|
| Thunderstorm Wind |