Fix OOM bug that SegmentBitset allocate more than the 2M size

deps/oblib/src/lib/container/ob_2d_array.h

@@ -531,7 +531,7 @@ int Ob2DArray<T, max_block_size, BlockAllocatorT, auto_free, BlockPointerArrayT>
         const int64_t current_blocks = get_block_count();
         for (int64_t i = current_blocks; OB_SUCC(ret) && i < need_blocks; ++i) {
           if (OB_FAIL(new_block())) {
-            LIB_LOG(WARN, "failed: new_block()", K(ret));
+            LIB_LOG(WARN, "failed: new_block()", K(ret), K(need_blocks), K(capacity));
           }
         }
       }

src/sql/engine/aggregate/ob_exec_hash_struct.h

@@ -442,7 +442,7 @@ public:
   }
 
 private:
-  ObSegmentBitSet<> bits_;
+  ObSegmentBitSet<common::OB_MALLOC_BIG_BLOCK_SIZE> bits_;
   int64_t cnt_;  // power of 2
   int64_t h2_shift_;
 };

src/sql/engine/ob_tenant_sql_memory_manager.cpp

@@ -824,7 +824,10 @@ int ObTenantSqlMemoryManager::get_max_work_area_size(int64_t& max_wa_memory_size
       if (OB_FAIL(ObResourceMgr::get_instance().get_tenant_resource_mgr(tenant_id_, resource_handle))) {
         ret = OB_SUCCESS;
       } else {
-        max_tenant_memory_size += resource_handle.get_memory_mgr()->get_cache_hold();
+        // TODO: kvcache大概可以淘汰多少内存，目前没有数据，后续寒晖他们会提供接口
+        // bug34818894 https://work.aone.alibaba-inc.com/issue/34818894
+        // 这里暂时写一个默认比例
+        max_tenant_memory_size += resource_handle.get_memory_mgr()->get_cache_hold() * 0.05;
       }
     }
     int64_t remain_memory_size =