amorynan commented on code in PR #44533:
URL: https://github.com/apache/doris/pull/44533#discussion_r1857714089
##########
be/src/vec/exprs/table_function/vexplode.cpp:
##########
@@ -37,6 +42,34 @@ VExplodeTableFunction::VExplodeTableFunction() {
_fn_name = "vexplode";
}
+Status VExplodeTableFunction::_process_init_variant(Block* block, int
value_column_idx) {
+ // explode variant array
+ const auto& variant_column = check_and_get_column<ColumnObject>(
+ remove_nullable(block->get_by_position(value_column_idx)
+ .column->convert_to_full_column_if_const())
+ .get());
+ _detail.output_as_variant = true;
+ if (!variant_column->is_null_root()) {
+ _array_column = variant_column->get_root();
+ // We need to wrap the output nested column within a variant column.
+ // Otherwise the type is missmatched
+ const auto* array_type = check_and_get_data_type<DataTypeArray>(
+ remove_nullable(variant_column->get_root_type()).get());
+ if (array_type == nullptr) {
+ return Status::NotSupported("explode not support none array type
{}",
+
variant_column->get_root_type()->get_name());
+ }
+ _detail.nested_type = array_type->get_nested_type();
+ } else {
+ // null root, use nothing type
+ _array_column =
ColumnNullable::create(ColumnArray::create(ColumnNothing::create(0)),
+ ColumnUInt8::create(0));
+
_array_column->assume_mutable()->insert_many_defaults(variant_column->size());
+ _detail.nested_type = std::make_shared<DataTypeNothing>();
Review Comment:
maybe here should wrap in nullable , because many calculate operator
behavior just make nested column in array as nullable
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