Functions:
Item Description
ARRAYSLICE Function
Returns an array containing a slice of the input array, as determined by starting and ending index parameters.
ARRAYMERGEELEMENTS Function
Merges the elements of an array in left to right order into a string. Values are optionally delimited by a provided delimiter.
Source:
The following set of arrays contain results, in order, of a series of races. From this list, the goal is to extract a list of the podium finishers for each race as a single string.
| RaceId | RaceResults |
|---|---|
| 1 | ["racer3","racer5","racer2","racer1","racer6"] |
| 2 | ["racer6","racer4","racer2","racer1","racer3","racer5"] |
| 3 | ["racer4","racer3","racer5","racer2","racer6","racer1"] |
| 4 | ["racer1","racer2","racer3","racer5"] |
| 5 | ["racer5","racer2","racer4","racer6","racer3"] |
Transformation:
From the list of arrays, the first step is to gather the top-3 finishers from each race:
| Transformation Name | New formula |
|---|---|
| Parameter: Formula type | Single row formula |
| Parameter: Formula | ARRAYSLICE(RaceResults, 0, 3) |
| Parameter: New column name | 'arrPodium' |
The above captures the first three values of the RaceResults arrays into a new set of arrays.
The next step is to merge this new set of arrays into a single string:
| Transformation Name | New formula |
|---|---|
| Parameter: Formula type | Single row formula |
| Parameter: Formula | ARRAYMERGEELEMENTS(arrPodium, ',') |
| Parameter: New column name | 'strPodium' |
Results:
| RaceId | RaceResults | arrPodium | strPodium |
|---|---|---|---|
| 1 | ["racer3","racer5","racer2","racer1","racer6"] | ["racer3","racer5","racer2"] | racer3,racer5,racer2 |
| 2 | ["racer6","racer4","racer2","racer1","racer3","racer5"] | ["racer6","racer4","racer2"] | racer6,racer4,racer2 |
| 3 | ["racer4","racer3","racer5","racer2","racer6","racer1"] | ["racer4","racer3","racer5"] | racer4,racer3,racer5 |
| 4 | ["racer1","racer2","racer3","racer5"] | ["racer1","racer2","racer3"] | racer1,racer2,racer3 |
| 5 | ["racer5","racer2","racer4","racer6","racer3"] | ["racer5","racer2","racer4"] | racer5,racer2,racer4 |
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