How to subset/select properties from an object set?

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1

I am trying to create a function that takes in an object set and returns a subset of the object set by choosing one property. I need to use a function since I need this to be dynamic for my visualizations. Is there no select ability? It seems like a relatively straight forward thing but I come from a class data science background, very new in palantir.

2

Where are you making this visualization? What type of function are you writing (python, TSv2, TS)?

Can you share some more details around the use case

3

Of course! I was trying in python but I’m open to typescript if it can handle the job better.

for the visualization - I am in Workshop, trying to make a choropleth map and change what variable the choropleth is colored by. All the variables are in an object set, and I want to have a drop-down that chooses the variable. I have 80+ variables which is why I’m needing a dynamic solution.

4

In TSv2 you can do something like this (this is not supported inTSv1). I am not sure if it is supported in python.

client(<objectType>).where(...
)
.fetchPage({
    $select: ["property1", "property2"]
    $pageSize: 1
  })

Depending on how exactly you are grouping your data, it might make sense to leverage the aggregation ability of the ontology to more easily get what you are looking for.

5

Thank you! Unfortunately I need the functions output to be an object set directly to get it to work in the map; fetchPage doesn’t return an object set.

6

If you need to return an object set then selecting properties is unnecessary / won’t be any more performant. The selection will only help when you try to actually materialize the object set into a list of objects.