take_anyif() (aggregation function)

Arbitrarily selects one record for each group in a summarize operator in records 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.

Syntax

take_anyif( expr, predicate )

Parameters

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')

Output

Related content

• take_any function
• arg_max function
• arg_min function