zeroshade commented on a change in pull request #10106:
URL: https://github.com/apache/arrow/pull/10106#discussion_r619893431
##########
File path: go/arrow/datatype_nested.go
##########
@@ -148,6 +148,40 @@ func (t *StructType) FieldByName(name string) (Field,
bool) {
return t.fields[i], true
}
+type MapType struct {
+ value *ListType
+ KeysSorted bool
+}
+
+func MapOf(key, item DataType) *MapType {
+ if key == nil || item == nil {
+ panic("arrow: nil key or item type for MapType")
+ }
+
+ return &MapType{value: ListOf(StructOf(Field{Name: "key", Type: key},
Field{Name: "value", Type: item, Nullable: true}))}
Review comment:
Ok, I confirmed that the names hardcoded here do not affect reading maps
that name it differently. The assumption, as per the spec, is always that the
first field is the keys and the second field is the values.
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