Merge pull request ClickHouse#72555 from ClickHouse/raise_default_for…

…_prealloc_in_ht_optimisation

Raise defaults for preallocation in HTs optimisation

src/Core/Settings.cpp

@@ -4312,14 +4312,14 @@ SELECT * FROM x_dist ORDER BY number ASC;
     DECLARE(Bool, collect_hash_table_stats_during_aggregation, true, R"(
 Enable collecting hash table statistics to optimize memory allocation
 )", 0) \
-    DECLARE(UInt64, max_size_to_preallocate_for_aggregation, 100'000'000, R"(
+    DECLARE(UInt64, max_size_to_preallocate_for_aggregation, 1'000'000'000'000, R"(
 For how many elements it is allowed to preallocate space in all hash tables in total before aggregation
 )", 0) \
     \
     DECLARE(Bool, collect_hash_table_stats_during_joins, true, R"(
 Enable collecting hash table statistics to optimize memory allocation
 )", 0) \
-    DECLARE(UInt64, max_size_to_preallocate_for_joins, 100'000'000, R"(
+    DECLARE(UInt64, max_size_to_preallocate_for_joins, 1'000'000'000'000, R"(
 For how many elements it is allowed to preallocate space in all hash tables in total before join
 )", 0) \
     \

src/Core/SettingsChangesHistory.cpp

@@ -60,6 +60,8 @@ static std::initializer_list<std::pair<ClickHouseVersion, SettingsChangesHistory
 {
     {"24.12",
         {
+            {"max_size_to_preallocate_for_aggregation", 100'000'000, 1'000'000'000'000, "Enable optimisation for bigger tables."},
+            {"max_size_to_preallocate_for_joins", 100'000'000, 1'000'000'000'000, "Enable optimisation for bigger tables."},
             {"parallel_replicas_index_analysis_only_on_coordinator", false, true, "Index analysis done only on replica-coordinator and skipped on other replicas. Effective only with enabled parallel_replicas_local_plan"},
             {"use_async_executor_for_materialized_views", false, false, "New setting."},
         }