BiteTheDDDDt commented on code in PR #13273:
URL: https://github.com/apache/doris/pull/13273#discussion_r995308928
##########
be/src/olap/schema_change.cpp:
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@@ -834,8 +834,34 @@ Status RowBlockChanger::change_block(vectorized::Block*
ref_block,
}
for (auto it : swap_idx_map) {
- new_block->get_by_position(it.second).column.swap(
- ref_block->get_by_position(it.first).column);
+ auto& ref_col = ref_block->get_by_position(it.first);
+ auto& new_col = new_block->get_by_position(it.second);
+
+ bool ref_col_nullable = ref_col.column->is_nullable();
+ bool new_col_nullable = new_col.column->is_nullable();
+
+ if (ref_col_nullable != new_col_nullable) {
+ // not nullable to nullable
+ if (new_col_nullable) {
+ auto* new_nullable_col =
assert_cast<vectorized::ColumnNullable*>(
+ std::move(*new_col.column).mutate().get());
+
+ new_nullable_col->swap_nested_column(ref_col.column);
+
new_nullable_col->get_null_map_data().resize_fill(new_nullable_col->size());
+ } else {
+ // nullable to not nullable:
Review Comment:
It is best to add a logic to check that the nullmap does not contain null.
If there is null data, the schema change will fail to prevent accidental data
loss.
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