Jerry Hu 8f4bb0f804 [improvement](agg) iterate aggregation data in memory written order (#12704) ...

Following the iteration order of the hash table will result in out-of-order access to aggregate states, which is very inefficient.
Traversing aggregate states in memory write order can significantly improve memory read efficiency.

Test
hash table items count: 3.35M

Before this optimization: insert keys into column takes 500ms
With this optimization only takes 80ms

2022-09-21 14:58:50 +08:00

..

fixed_hash_map.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

fixed_hash_table.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

hash_map.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

hash_set.h

[style] clang-format all c++ code (#9305)

2022-04-29 16:14:22 +08:00

hash_table_allocator.h

[feature](vectorization) Support Vectorized Exec Engine In Doris (#7785)

2022-01-18 10:07:15 +08:00

hash_table_key_holder.h

[feature](vectorization) Support Vectorized Exec Engine In Doris (#7785)

2022-01-18 10:07:15 +08:00

hash_table_utils.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

hash_table.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

hash.h

[improvement]Use phmap for aggregation with integer keys (#11175)

2022-07-27 13:58:20 +08:00

ph_hash_map.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

string_hash_map.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00

string_hash_table.h

[improvement](agg) iterate aggregation data in memory written order (#12704)

2022-09-21 14:58:50 +08:00