HappenLee commented on code in PR #64010:
URL: https://github.com/apache/doris/pull/64010#discussion_r3360793354
##########
be/src/storage/segment/segment_iterator.cpp:
##########
@@ -586,6 +470,39 @@ Status SegmentIterator::_init_impl(const
StorageReadOptions& opts) {
return Status::OK();
}
+Status SegmentIterator::_init_project_schema() {
+ _schema_block_id_map.assign(_schema->columns().size(), -1);
+ for (int i = 0; i < _schema->num_column_ids(); i++) {
+ auto cid = _schema->column_id(i);
+ _schema_block_id_map[cid] = i;
+ }
+
+ _project_schema = _opts.project_columns != nullptr
+ ?
std::make_shared<Schema>(_opts.tablet_schema->columns(),
+
*_opts.project_columns)
+ : _schema;
+ return Status::OK();
+}
+
+Status SegmentIterator::_build_project_block(Block* block, Block*
project_block) {
+ project_block->clear();
Review Comment:
这个现在普通的dup key表，MOW表也会走到这里，这里应该加一个快速路径的判断，就是如果发现这个project
schema和普通schema一样的话，就直接返回block吧
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