[GitHub] [incubator-doris] acelyc111 commented on a change in pull request #5514: [BUG] fix memory limit failure and optimize memory usage in join stage

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

acelyc111 commented on a change in pull request #5514:
URL: https://github.com/apache/incubator-doris/pull/5514#discussion_r593548993



##########
File path: be/src/exec/hash_join_node.h
##########
@@ -174,6 +175,11 @@ class HashJoinNode : public ExecNode {
     // This is only used for debugging and outputting the left child rows before
     // doing the join.
     std::string get_probe_row_output_string(TupleRow* probe_row);
+
+    // _release_context_counter should be power of 2
+    // GCC will GCC will optimize the modulo operation to &(release_context_counter - 1)

Review comment:
       ```suggestion
       // GCC will optimize the modulo operation to &(release_context_counter - 1)
   ```

##########
File path: be/src/exec/hash_join_node.h
##########
@@ -174,6 +175,11 @@ class HashJoinNode : public ExecNode {
     // This is only used for debugging and outputting the left child rows before
     // doing the join.
     std::string get_probe_row_output_string(TupleRow* probe_row);
+
+    // _release_context_counter should be power of 2

Review comment:
       How about define it as `static constexpr int _release_context_counter = 1 << 5;` ?




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