Hello,
I'm working on getting nested dictionaries to work in the C++ IPC
implementation, together with integration tests.
My current implementation introduces a restriction. Let's say we have
the following schema field:
- type: List
- dictionaryEncoding:
- id: 123
- indexType: Int32
- children[0]:
- type: String
- dictionaryEncoding:
- id: 456
- indexType: Int32
then my C++ patch requires that the dictionary batch for the inner
dictionary (id 456) appears before the dictionary batch for the outer
dictionary (id 123). It seems like a reasonable restriction, but I'd
like to check if that's ok. Also, should we add it to the spec?
Regards
Antoine.
