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d2ab7fc26d
Introduce a collection_constructor (similar to C++'s std::initializer_list) to hold subexpressions being gathered into a list. Since sets, maps, and lists construction share some attributes (all elements must be of the same type) collection_constructor will be used for all of them, so it also holds an enum. I used "style" for the enum since it's a weak attribute - an empty set is also an empty map. I chose collection_constructor rather than plain 'collection' to highlight that it's not the only way to get a collection (selecting a collection column is another, as an example) and to hint at what it does - construct a collection from more primitive elements.