dqkqd commented on code in PR #8765:
URL: https://github.com/apache/arrow-rs/pull/8765#discussion_r2484111667
##########
arrow-schema/src/datatype_display.rs:
##########
@@ -139,8 +139,9 @@ impl fmt::Display for DataType {
Ok(())
}
Self::Union(union_fields, union_mode) => {
- write!(f, "Union({union_mode:?}, ")?;
+ write!(f, "Union({union_mode:?}")?;
if !union_fields.is_empty() {
+ write!(f, ", ")?;
Review Comment:
Allow empty union to be displayed like `Union(Dense)`, instead of
`Union(Dense, )`
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