EXAMPLE - Extractkv and Unnest Transforms

This example shows how you can unpack data nested in an Object into separate columns.

Source:

You have the following information on used cars. The VIN column contains vehicle identifiers, and the Properties column contains key-value pairs describing characteristics of each vehicle. You want to unpack this data into separate columns.

VIN	Properties
XX3 JT4522	year=2004,make=Subaru,model=Impreza,color=green,mileage=125422,cost=3199
HT4 UJ9122	year=2006,make=VW,model=Passat,color=silver,mileage=102941,cost=4599
KC2 WZ9231	year=2009,make=GMC,model=Yukon,color=black,mileage=68213,cost=12899
LL8 UH4921	year=2011,make=BMW,model=328i,color=brown,mileage=57212,cost=16999

Transformation:

Add the following transformation, which identifies all of the key values in the column as beginning with alphabetical characters.

The valueafter string identifies where the corresponding value begins after the key.
The delimiter string indicates the end of each key-value pair.

Transformation Name	`Convert keys/values into Objects`
Parameter: Column	Properties
Parameter: Key	`{alpha}+`
Parameter: Separator between key and value	`=`
Parameter: Delimiter between pair	','

Now that the Object of values has been created, you can use the unnest transform to unpack this mapped data. In the following, each key is specified, which results in separate columns headed by the named key:

Anmerkung

Each key must be entered on a separate line in the Path to elements area.

Transformation Name	`Unnest Objects into columns`
Parameter: Column	extractkv_Properties
Parameter: Paths to elements	year
Parameter: Paths to elements	make
Parameter: Paths to elements	model
Parameter: Paths to elements	color
Parameter: Paths to elements	mileage
Parameter: Paths to elements	cost

Results:

When you delete the unnecessary Properties columns, the dataset now looks like the following:

VIN	year	make	model	color	mileage	cost
XX3 JT4522	2004	Subaru	Impreza	green	125422	3199
HT4 UJ9122	2006	VW	Passat	silver	102941	4599
KC2 WZ9231	2009	GMC	Yukon	black	68213	12899
LL8 UH4921	2011	BMW	328i	brown	57212	16999

In diesem Abschnitt:

EXAMPLE - Extractkv and Unnest Transforms

Suchresultat