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[opt](inverted index) Optimization of the initialization process in topn #37429

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Jul 15, 2024
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[opt](inverted index) Optimization of the initialization process in topn #37429

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15 changes: 9 additions & 6 deletions be/src/olap/rowset/segment_v2/segment_iterator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1942,7 +1942,8 @@ Status SegmentIterator::_read_columns(const std::vector<ColumnId>& column_ids,
}

Status SegmentIterator::_init_current_block(
vectorized::Block* block, std::vector<vectorized::MutableColumnPtr>& current_columns) {
vectorized::Block* block, std::vector<vectorized::MutableColumnPtr>& current_columns,
uint32_t nrows_read_limit) {
block->clear_column_data(_schema->num_column_ids());

for (size_t i = 0; i < _schema->num_column_ids(); i++) {
Expand All @@ -1962,7 +1963,7 @@ Status SegmentIterator::_init_current_block(
column_desc->path() == nullptr ? "" : column_desc->path()->get_path());
// TODO reuse
current_columns[cid] = file_column_type->create_column();
current_columns[cid]->reserve(_opts.block_row_max);
current_columns[cid]->reserve(nrows_read_limit);
} else {
// the column in block must clear() here to insert new data
if (_is_pred_column[cid] ||
Expand All @@ -1981,7 +1982,7 @@ Status SegmentIterator::_init_current_block(
} else if (column_desc->type() == FieldType::OLAP_FIELD_TYPE_DATETIME) {
current_columns[cid]->set_datetime_type();
}
current_columns[cid]->reserve(_opts.block_row_max);
current_columns[cid]->reserve(nrows_read_limit);
}
}
}
Expand Down Expand Up @@ -2387,14 +2388,16 @@ Status SegmentIterator::_next_batch_internal(vectorized::Block* block) {
}
}
}
RETURN_IF_ERROR(_init_current_block(block, _current_return_columns));
_converted_column_ids.assign(_schema->columns().size(), 0);

_current_batch_rows_read = 0;
uint32_t nrows_read_limit = _opts.block_row_max;
if (_can_opt_topn_reads()) {
nrows_read_limit = std::min(static_cast<uint32_t>(_opts.topn_limit), nrows_read_limit);
}

RETURN_IF_ERROR(_init_current_block(block, _current_return_columns, nrows_read_limit));
_converted_column_ids.assign(_schema->columns().size(), 0);

_current_batch_rows_read = 0;
RETURN_IF_ERROR(_read_columns_by_index(
nrows_read_limit, _current_batch_rows_read,
_lazy_materialization_read || _opts.record_rowids || _is_need_expr_eval));
Expand Down
3 changes: 2 additions & 1 deletion be/src/olap/rowset/segment_v2/segment_iterator.h
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Expand Up @@ -222,7 +222,8 @@ class SegmentIterator : public RowwiseIterator {
bool set_block_rowid);
void _replace_version_col(size_t num_rows);
Status _init_current_block(vectorized::Block* block,
std::vector<vectorized::MutableColumnPtr>& non_pred_vector);
std::vector<vectorized::MutableColumnPtr>& non_pred_vector,
uint32_t nrows_read_limit);
uint16_t _evaluate_vectorization_predicate(uint16_t* sel_rowid_idx, uint16_t selected_size);
uint16_t _evaluate_short_circuit_predicate(uint16_t* sel_rowid_idx, uint16_t selected_size);
void _output_non_pred_columns(vectorized::Block* block);
Expand Down
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