exportSchema

fnArrowSchema exportSchema(DataType dtype, string name = null) @trusted

Builds the ArrowSchema for one dtype: the verified format string, an optional name, null metadata, and the rich kinds' wiring - LIST carries its element child ("item"), CATEGORICAL carries its labels dictionary, STRUCT rejects (the storage tier drops field names). The strings and the nested tree are owned by the schema: the release callback frees them exactly once, recursively.

Parameters

`dtype`	the dtype to describe
`name`	the optional field name (null for none)

Returns

the schema (caller must call release).

Throws

DataFrameException for STRUCT and non-STRING categorical

labels.