Page tree

NOTE:  Trifacta Wrangler is a free product with limitations on its features. Some features in the documentation do not apply to this product edition. See Product Limitations.

   

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)


ArgumentRequired?Data TypeDescription
array_ref1Ystring or arrayName of first column or first array literal to apply to the function
array_ref2Ystring or arrayName 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 TypeExample Value
YesArray literal or column referencemyArray1, myArray2

Examples

Tip: For additional examples, see Common Tasks.

Example - Simple intersection example

This example illustrates how to use the nested functions.

Functions:

ItemDescription
ARRAYCONCAT Function Combines the elements of one array with another, listing all elements of the first array before listing all elements of the second array.
ARRAYINTERSECT Function Generates an array containing all elements that appear in multiple input arrays, referenced as column names or array literals.
ARRAYCROSS Function Generates a nested array containing the cross-product of all elements in two or more arrays.
ARRAYUNIQUE Function Generates an array of all unique elements among one or more arrays.

Source:

Code formatting has been applied to improve legibility.

ItemArrayAArrayB
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:

ItemArrayAArrayBconcat2intersection2
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:

Itemcross2
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:

Itemunique2
Item1["A","B","C","1","2","3"]
Item2["A","B","C"]
Item3["D","E","F","4","5","6"]

See Also for EXAMPLE - Nested Functions:

This page has no comments.