eldenmoon commented on code in PR #30153:
URL: https://github.com/apache/doris/pull/30153#discussion_r1467155766
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be/src/vec/common/schema_util.cpp:
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@@ -152,13 +152,31 @@ Status cast_column(const ColumnWithTypeAndName& arg,
const DataTypePtr& type, Co
Block tmp_block {arguments};
size_t result_column = tmp_block.columns();
auto ctx = FunctionContext::create_context(nullptr, {}, {});
+
+ // To prevent from null info lost, we should not call function since the
function framework will wrap
+ // nullable to Variant instead of the root of Variant
+ // Nullable(Array(int)) -> Variant<Nullable(Array(int))>
+ if (WhichDataType(remove_nullable(type)).is_variant_type()) {
+ // set variant root column/type to from column/type
+ auto variant = ColumnObject::create(true /*always nullable*/);
+ CHECK(arg.column->is_nullable());
Review Comment:
all the subcolumn is stored ad nullable
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