zeroshade commented on code in PR #34343:
URL: https://github.com/apache/arrow/pull/34343#discussion_r1128553464


##########
go/arrow/csv/reader.go:
##########
@@ -731,15 +731,19 @@ func (r *Reader) parseList(field array.Builder, str 
string) {
                field.AppendNull()
                return
        }
-       if !(strings.HasPrefix(str, "{") || strings.HasSuffix(str, "}")) {
+       if !(strings.HasPrefix(str, "{") && strings.HasSuffix(str, "}")) {
                r.err = errors.New("invalid list format. should start with '{' 
and end with '}'")
-               field.AppendNull()
                return
        }
        str = strings.TrimPrefix(str, "{")
        str = strings.TrimSuffix(str, "}")

Review Comment:
   I think this can be condensed into a single call to `strings.Trim(str, "{}")`



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