serramatutu commented on code in PR #833:
URL: https://github.com/apache/arrow-go/pull/833#discussion_r3864335360
##########
arrow/array/util.go:
##########
@@ -296,7 +296,11 @@ func RecordToJSON(rec arrow.RecordBatch, w io.Writer)
error {
cols := make(map[string]interface{})
for i := 0; int64(i) < rec.NumRows(); i++ {
for j, c := range rec.Columns() {
- cols[fields[j].Name] = c.GetOneForMarshal(i)
+ if rec.Schema().Field(j).Nullable && c.IsNull(i) {
Review Comment:
Per this: https://github.com/serramatutu/arrow-internal-nulls
In C++, it looks like the general approach is "validate all data in", then
assume it's OK/consistent when "writing out". I.e it is an invariant that the
data is correct when writing out.
If the user has messed around with the data:
- by tweaking memory directly: they need to ensure their code respects
invariants OR call ValidateFull
- by using a public API: the API will always leave the array in a consistent
internal state
This is my rationale for calling GetOneForMarshal() here: we assume the data
is correct, if it's not then it's UB.
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