ARRAYINTERSECT Function

Generates an array containing all elements that appear in multiple input arrays, referenced as column names or array literals.

Wrangle vs. SQL: This function is part of Wrangle, a proprietary data transformation language. Wrangle is not SQL. For more information, see Wrangle Language.

Basic Usage

Array literal reference example:

arrayintersect([["A","B","C"],["A","D","E"]])

Output: Returns a single array with a single element:

["A"]

Column reference example:

arrayintersect([array1,array2])

Output: Returns a single array listing all of the elements that appear in both array1 and array2 in order.

Syntax and Arguments

arrayintersect(array_ref1,array_ref2)

Argument	Required?	Data Type	Description
array_ref1	Y	string or array	Name of first column or first array literal to apply to the function
array_ref2	Y	string or array	Name of second column or second array literal to apply to the function

For more information on syntax standards, see Language Documentation Syntax Notes.

array_ref1, array_ref2

Array literal or name of the array column whose intersection you want to derive. You can intersect two or more array columns together.

Usage Notes:

Required?	Data Type	Example Value
Yes	Array literal or column reference	`myArray1`, `myArray2`

Examples

Tip

For additional examples, see Common Tasks.

Example - Simple intersection example

This simple example illustrates how the following functions operate on nested data.

ARRAYCONCAT - Concatenate multiple arrays together. See ARRAYCONCAT Function.
ARRAYINTERSECT - Find the intersection of elements between multiple arrays. See ARRAYINTERSECT Function.
ARRAYCROSS - Compute the cross product of multiple arrays. See ARRAYCROSS Function.
ARRAYUNIQUE - Generate unique values across multiple arrays. See ARRAYUNIQUE Function.

Source:

Code formatting has been applied to improve legibility.

Item	ArrayA	ArrayB
Item1	["A","B","C"]	["1","2","3"]
Item2	["A","B"]	["A","B","C"]
Item3	["D","E","F"]	["4","5","6"]

Transformation:

You can apply the following transforms in the following order. Note that the column names must be different from the transform name, which is a reserved word.

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYCONCAT([Letters,Numerals])
Parameter: New column name	'concat2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYINTERSECT([Letters,Numerals])
Parameter: New column name	'intersection2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYCROSS([Letters,Numerals])
Parameter: New column name	'cross2'

Transformation Name	`New formula`
Parameter: Formula type	Single row formula
Parameter: Formula	ARRAYUNIQUE([Letters,Numerals])
Parameter: New column name	'unique2'

Results:

For display purposes, the results table has been broken down into three separate sets of columns.

Column set 1:

Item	ArrayA	ArrayB	concat2	intersection2
Item1	`["A","B","C"]`	["1","2","3"]	["A","B","C","1","2","3"]	`[ ]`
Item2	["A","B"]	["A","B","C"]	["A","B","A","B","C"]	["A","B"]
Item3	["D","E","F"]	["4","5","6"]	["D","E","F","4","5","6"]	[ ]

Column set 2:

Item	cross2
Item1	[["A","1"],["A","2"],["A","3"],["B","1"],["B","2"],["B","3"],["C","1"],["C","2"],["C","3"]]
Item2	[["A","A"],["A","B"],["A","C"],["B","A"],["B","B"],["B","C"]]
Item3	[["D","4"],["D","5"],["D","6"],["E","4"],["E","5"],["E","6"], ["F","4"],["F","5"],["F","6"]]

Item

cross2

Item1

[["A","1"],["A","2"],["A","3"],["B","1"],["B","2"],["B","3"],["C","1"],["C","2"],["C","3"]]

Item2

[["A","A"],["A","B"],["A","C"],["B","A"],["B","B"],["B","C"]]

Item3

[["D","4"],["D","5"],["D","6"],["E","4"],["E","5"],["E","6"], ["F","4"],["F","5"],["F","6"]]

Column set 3:

Item	unique2
Item1	["A","B","C","1","2","3"]
Item2	["A","B","C"]
Item3	["D","E","F","4","5","6"]