[incubator-doris] 06/17: [performance][query]improve the performance of DISTINCT aggregation by using flat hash set replace unordered set (#9401)

[morningman]

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morningman pushed a commit to branch dev-1.0.1
in repository https://gitbox.apache.org/repos/asf/incubator-doris.git

commit 343f97f028bc33bae07a869864fb034bd5ceb462
Author: shee <13843187+qz...@users.noreply.github.com>
AuthorDate: Fri May 6 17:43:14 2022 -0700

    [performance][query]improve the performance of DISTINCT aggregation by 
using flat hash set replace unordered set (#9401)
    
    Co-authored-by: shizhiqiang03 <shizhiqian...@meituan.com>
---
 be/src/exprs/aggregate_functions.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/be/src/exprs/aggregate_functions.cpp 
b/be/src/exprs/aggregate_functions.cpp
index 700851aad0..3e2f4b3fe5 100644
--- a/be/src/exprs/aggregate_functions.cpp
+++ b/be/src/exprs/aggregate_functions.cpp
@@ -1313,7 +1313,8 @@ private:
         }
     };
 
-    std::unordered_set<T, NumericHashHelper> _set;
+    phmap::flat_hash_set<T, NumericHashHelper> _set;
+
     // Because Anyval does not provide the hash function, in order
     // to adopt the type different from the template, the pointer is used
     // HybridSetBase* _set;
@@ -1470,7 +1471,8 @@ public:
 private:
     const int DECIMAL_BYTE_SIZE = 16;
 
-    std::unordered_set<DecimalV2Value> _set;
+    phmap::flat_hash_set<DecimalV2Value> _set;
+
     FunctionContext::Type _type;
 };
 
@@ -1555,7 +1557,8 @@ private:
     const int DATETIME_PACKED_TIME_BYTE_SIZE = 8;
     const int DATETIME_TYPE_BYTE_SIZE = 4;
 
-    std::unordered_set<DateTimeVal, DateTimeHashHelper> _set;
+    phmap::flat_hash_set<DateTimeVal, DateTimeHashHelper> _set;
+
     FunctionContext::Type _type;
 };
 


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