zenoyang commented on code in PR #10084:
URL: https://github.com/apache/doris/pull/10084#discussion_r901839029
##########
be/src/vec/olap/block_reader.cpp:
##########
@@ -133,6 +133,29 @@ Status BlockReader::init(const ReaderParams& read_params) {
return status;
}
+ // only group by key num <= 3 and has bitmap_union col, enable block
aggregate
+ if (config::enable_block_aggregate_in_scanner && _aggregation &&
+ (_tablet->keys_type() == AGG_KEYS)) {
+ int agg_key_size = 0;
+ for (int i = 0; i < return_column_size; ++i) {
+ auto cid = read_params.origin_return_columns->at(i);
+ auto& col = _tablet->tablet_schema().column(cid);
+ if (col.is_key() && ++agg_key_size > 3) {
+ _block_aggregation = false;
+ break;
+ }
+ if (!col.is_key() &&
+ col.aggregation() ==
FieldAggregationMethod::OLAP_FIELD_AGGREGATION_BITMAP_UNION) {
Review Comment:
May be. Because the aggregated single-threaded throughput such as `sum` and
`count` is already very large, whether it is necessary to use multi-threading
requires more testing.
I'll provide more tests soon to decide if it's more general.
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