union() Function

Function

union( array1, array2 )

Returns all unique elements from the given arrays.

Keyword	Type	Description
`array1`	Any Type Array	Array to combine.
`array2`	Any Type Array	Array to combine.

Any Type Array, matching the type of the inputs

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

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 an array with 1, 2, 3, 4

This can also be accomplished by comparing an array with itself:

union(local!myArray, local!myArray) removes the duplicate elements from local!myArray.

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

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 an array with a, b, 1, 2

Every field of a CDT, dictionary, or map 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 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 an array with a, b, c, ""

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 an array with 1, 2

Scalar values are cast to arrays with a single entry:

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

The table below lists this function's compatibility with various features in Appian.

Feature	Compatibility	Note
Portals	Compatible
Offline Mobile	Compatible
Sync-Time Custom Record Fields	Compatible	Can be used to create a custom record field that only evaluates at sync time.
Real-Time Custom Record Fields	Incompatible	Custom record fields that evaluate in real time must be configured using one or more Custom Field functions.
Process Reports	Compatible
Process Events	Compatible

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