Track memory usage more accurate for tpch Q18 with SF50
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement
According to the description of https://github.com/pingcap/tidb/pull/37405, the actual memory usage of Q18 arrives ~37GB even we `set @@mem_quota_query = 30GB`.
We need to find where the 7GB of memory space is occupied.
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