Support Map as a ScalarValue about arrow-datafusion HOT 4 CLOSED

I think ScalarValue::Map should follow the same pattern as ScalarValue::List ScalarValue::Struct

So that would mean a single element MapArray: https://docs.rs/arrow/latest/arrow/array/struct.MapArray.html

enum ScalarValue {
  ...
  Map(Arc<MapArray>)
  ...
}

Does that make sense?

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take

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enum ScalarValue {
  ...
  Map(Arc<MapArray>)
  ...
}

Does that make sense?

Many thanks! It looks good to me. I didn't notice this struct. I will try to follow this pattern to implement this.

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I'm interested in this issue.
As @alamb said in #8262 (comment) :

l I think ScalarValue::Map can follow the model of ScalarValue::List (as Maps are just lists of structs, as I undertand):

I think I can used a list of structs with the same type struct to implemented a basic version like:

List<Struct<K, V>>

Then, provide the HashMap (or others) implementation for the physical plan.
Does it make sense?

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