Arrow.Array.Dictionary (Arrow v0.1.0)

Dictionary-encoded column. The buffer is just the indices (a primitive integer array referencing entries in a dictionary stored separately, identified by dictionary_id).

The dictionary itself is not held on the array. It's transmitted in the IPC stream as a DictionaryBatch message and held in the decoder's session-level registry — Arrow.Logical.batches_equal?/3 and similar comparators that need to resolve the underlying values take the registry as an additional argument.

Summary

Types

t()

Types

t()

@type t() :: %Arrow.Array.Dictionary{
  dictionary_id: non_neg_integer(),
  indices: Arrow.Array.t()
}