kou commented on a change in pull request #12041:
URL: https://github.com/apache/arrow/pull/12041#discussion_r776869489
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File path: c_glib/arrow-glib/scalar.cpp
##########
@@ -2039,6 +2039,16 @@ GList *
garrow_struct_scalar_get_value(GArrowStructScalar *scalar)
{
auto priv = GARROW_STRUCT_SCALAR_GET_PRIVATE(scalar);
+ if (!priv->value) {
+ auto arrow_scalar =
+ std::static_pointer_cast<arrow::StructScalar>(
+ garrow_scalar_get_raw(GARROW_SCALAR(scalar)));
+ for (auto arrow_element : arrow_scalar->value) {
+ priv->value = g_list_prepend(priv->value,
+ garrow_scalar_new_raw(&arrow_element));
+ }
+ priv->value = g_list_reverse(priv->value);
+ }
Review comment:
This is a idiom in GLib. This is for performance but this will not be
needed here.
`GList` is a linked list. `g_list_append()` is O(N) (N is the number of
elements). `g_list_prepend()` is O(1). `g_list_reverse()` is O(N).
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