jhorstmann commented on code in PR #3965:
URL: https://github.com/apache/arrow-rs/pull/3965#discussion_r1152326503
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arrow-schema/src/datatype.rs:
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@@ -182,7 +183,7 @@ pub enum DataType {
/// A single LargeList array can store up to [`i64::MAX`] elements in total
LargeList(Box<Field>),
Review Comment:
Another followup could be done for `Union`, although that would also benefit
from a `Vec<(Field, i8)>` instead of two separate vectors. I think that also
currently makes it the largest variant, which increases the needed size of all
datatypes.
A slightly hacky improvement for union could also be to move the `type_id`
into `Field` and leave it unused in most places. That should basically be free
since `Field` already has a few bits of padding left.
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