Array Query Functions

LogScale's array functions allow you to extract, create and manipulate items embedded in arrays, or to interpret arrays, within events. For more information, see Array Syntax.

Table: Array Query Functions

FunctionDefault ArgumentAvailabilityDescription
array:contains(array, value)array  Checks whether the given value matches any of the values of the array and excludes the event if no value matches
array:eval(array, [asArray], function, [var])array  Evaluates the function argument on all values in the array under the array argument overwriting the array
array:filter(array, [asArray], function, var)array  Drops entries from the input array using the given filtering function.
array:intersection(array, [as])array  Determines the set intersection of array values over input events
array:reduceAll(array, function, var)array  Computes a value from all events and array elements of the specified array.
array:reduceColumn(array, [as], function, var)array  Computes an aggregate value for each array element with the same index.
array:reduceRow(array, [as], function, var)array  Computes an aggregated value of an array on all events.
array:regex(array, [flags], regex)array  Checks whether the given pattern matches any of the values of the array and excludes the event from the search result
array:union(array, [as])array  Determines the set union of array values over input events.
concatArray([as], field, [from], [prefix], [separator], [suffix], [to])field  Concatenates values of all fields with same name and an array suffix into a new field.
split([field], [strip])field  Splits an event structure created by a JSON array into distinct events.
splitString([as], by, [field], [index])field  Splits a string by specifying a regular expression by which to split.

Common Recommendations for Array Query Functions

The following rules and recommendations apply to all the array query functions listed above.

  • Array functions do not support non-consecutive items in an array.

    For example, when manipulating the array:

    logscale
    foo[0], foo[1], foo[3]

    The function will only run against:

    logscale
    foo[0], foo[1]

  • Array indexes start at zero; For example, foo [0].

  • Arrays are identified using the array name with an [x] suffix.

    For example, having the array:

    logscale
    foo[0], foo[1]

    Adding another field:

    logscale
    foo[2]

    Would result in the array:

    logscale
    foo[0],foo[1],foo[2]

    With no missing entries, array functions will run against them all.

  • You cannot use nested arrays. For example, if you have foo[] in which each element is a bar[] you cannot give the argument:

    logscale
    foo[].bar[]