eldenmoon commented on code in PR #26749:
URL: https://github.com/apache/doris/pull/26749#discussion_r1393617499
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be/src/olap/rowset/segment_v2/segment_iterator.h:
##########
@@ -224,16 +227,46 @@ class SegmentIterator : public RowwiseIterator {
uint16_t* sel_rowid_idx,
size_t select_size,
vectorized::MutableColumns*
mutable_columns);
+ Status copy_column_data_by_selector(vectorized::IColumn* input_col_ptr,
+ vectorized::MutableColumnPtr&
output_col,
+ uint16_t* sel_rowid_idx, uint16_t
select_size,
+ size_t batch_size);
+
template <class Container>
[[nodiscard]] Status _output_column_by_sel_idx(vectorized::Block* block,
const Container& column_ids,
uint16_t* sel_rowid_idx,
uint16_t select_size) {
SCOPED_RAW_TIMER(&_opts.stats->output_col_ns);
for (auto cid : column_ids) {
int block_cid = _schema_block_id_map[cid];
-
RETURN_IF_ERROR(block->copy_column_data_to_block(_current_return_columns[cid].get(),
- sel_rowid_idx,
select_size, block_cid,
+ // Only the additional deleted filter condition need to
materialize column be at the end of the block
+ // We should not to materialize the column of query engine do not
need. So here just return OK.
+ // Eg:
+ // `delete from table where a = 10;`
+ // `select b from table;`
+ // a column only effective in segment iterator, the block from
query engine only contain the b column.
+ // so the `block_cid >= data.size()` is true
+ if (block_cid >= block->columns()) {
+ continue;
Review Comment:
The Block interface should remain oblivious to storage details, making the
use of args within it somewhat peculiar. Considering that
copy_column_data_to_block is exclusively utilized in the segment iterator, its
removal might be a viable option
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