[GitHub] [incubator-doris] Gabriel39 commented on a diff in pull request #10084: [feature-wip](vectorized) Support block aggregate in scanner

[GitBox <gi...@apache.org>]

Gabriel39 commented on code in PR #10084:
URL: https://github.com/apache/incubator-doris/pull/10084#discussion_r899757613


##########
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) {

Review Comment:
   if `col1` and `col2` are both table keys and agg keys, `_block_aggregation` should also be false because we will get a block  which is already aggregated



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