From ba0c1424787560212631e01f8086b37cb3f36867 Mon Sep 17 00:00:00 2001
From: zhang2014 <coswde@gmail.com>
Date: Wed, 20 Sep 2023 14:49:46 +0800
Subject: [PATCH] chore(query): use column memory size as group by hash approx
 size

---
 src/query/expression/src/kernels/group_by_hash.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/query/expression/src/kernels/group_by_hash.rs b/src/query/expression/src/kernels/group_by_hash.rs
index bdb0ae8c20a9..3445bf38e8a7 100644
--- a/src/query/expression/src/kernels/group_by_hash.rs
+++ b/src/query/expression/src/kernels/group_by_hash.rs
@@ -219,7 +219,7 @@ impl HashMethod for HashMethodSerializer {
         group_columns: &[(Column, DataType)],
         rows: usize,
     ) -> Result<KeysState> {
-        let mut approx_size = 0;
+        let mut approx_size = group_columns.len() * rows * 10;
 
         for (column, _data_type) in group_columns {
             approx_size += column.memory_size();