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union() Function

Function

union( array1, array2 )

Returns all unique elements from the given arrays.

Parameters

Keyword Type Description

`array1`

Any Type Array

Array to combine.

`array2`

Any Type Array

Array to combine.

Returns

Any Type Array, matching the type of the inputs

Examples

Find the superset of values from two integer arrays

`union({1, 2, 3, 4}, {3, 4, 5, 6})` returns and array with `1, 2, 3, 4, 5, 6`

Remove duplicates from an array

Remove the duplicates from an array by comparing it with an empty array of the same type:

`union({1, 2, 3, 4, 1, 2}, tointeger({}))` returns and array with `1, 2, 3, 4`

Values are matched with case sensitivity

`union({"a", "b"}, {"a", "B"})` returns and array with `a, b, B`

Array types must match

`union({"a", "b"}, {1, 2})` returns the following error: `Invalid types, can only act on data of the same type`.

NOTE: Use either the conversion functions or the `cast()` function to convert to the appropriate type.

`union({"a", "b"}, tostring({1, 2}))` returns and array with `a, b, 1, 2`

Every field of a CDT or dictionary must match to be treated as identical:

`union({a: 1, b: 2}, {a: 1, b: 2, c: 3})` returns `{{a: 1, b: 2}, {a: 1, b: 2, c: 3}}` `union({a: 1, b: 2}, {a: 1, b: 2})` returns `{{a: 1, b: 2}}`

Null values and empty lists

Null values are included as long as they are of the correct types (nulls of an incorrect type throw a type mismatch error):

`union({"a", "b"}, {"c", ""})` returns and array with `a, b, c, <null>`

Empty lists are ignored as long as they are of the correct types (empty lists of an incorrect type throw a type mismatch error):

`union(tointeger({}), {1, 2})` returns and array with `1, 2`

Scalar values

Scalar values are cast to arrays with a single entry:

`union(1, {2, 3})` returns and array with `1, 2, 3`

Feature compatibility

The table below lists this function's compatibility with various features in Appian.
Feature Compatibility Note
Portals Compatible
Offline Mobile Compatible
Custom Record Field Expressions Compatible
Process Reports Compatible
Process Events Compatible
Open in Github Built: Thu, May 23, 2024 (08:46:51 PM)

union() Function