zeroshade commented on a change in pull request #11359:
URL: https://github.com/apache/arrow/pull/11359#discussion_r741439840
##########
File path: go/arrow/array/struct.go
##########
@@ -105,6 +107,36 @@ func (a *Struct) setData(data *Data) {
}
}
+func (a *Struct) getOneForMarshal(i int) interface{} {
+ if a.IsNull(i) {
+ return nil
+ }
+
+ tmp := make(map[string]interface{})
+ fieldList := a.data.dtype.(*arrow.StructType).Fields()
+ for j, d := range a.fields {
+ tmp[fieldList[j].Name] = d.getOneForMarshal(i)
+ }
+ return tmp
+}
+
+func (a *Struct) MarshalJSON() ([]byte, error) {
+ var buf bytes.Buffer
+ enc := json.NewEncoder(&buf)
+
+ buf.WriteByte('[')
+ for i := 0; i < a.Len(); i++ {
Review comment:
In a struct column, each "value" in the list, is an object consisting of
keys from the struct field names with values for the corresponding index.
For example, a `struct<a: int, b: float>` column would be marshalled to `[
{"a": <a[0]>, "b": <b[0]>}, {"a": <a[1]>, "b": <b[1]> }, .... ]`. Does that
make more sense?
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