[improvement]Increase min_ht_mem of StreamingHtMinReductionEntry (#10787)

be/src/vec/exec/vaggregation_node.cpp

@@ -65,9 +65,11 @@ static constexpr StreamingHtMinReductionEntry STREAMING_HT_MIN_REDUCTION[] = {
         // Expand up to L2 cache always.
         {0, 0.0},
         // Expand into L3 cache if we look like we're getting some reduction.
-        {256 * 1024, 1.1},
+        // At present, The L2 cache is generally 1024k or more
+        {1024 * 1024, 1.1},
         // Expand into main memory if we're getting a significant reduction.
-        {2 * 1024 * 1024, 2.0},
+        // The L3 cache is generally 16MB or more
+        {16 * 1024 * 1024, 2.0},
 };
 
 static constexpr int STREAMING_HT_MIN_REDUCTION_SIZE =