When executing 'SELECT COUNT(*) FROM t', the OpenMLDB service exits directly due to being OOM (Out Of Memory) killed.

[wangdq]

Bug Description

In a bank customer anti-fraud scenario, the primary table t contains 400 million records with a single replica, and the memory utilization is 52%. After executing SELECT COUNT(*) FROM t, the OpenMLDB service exits. Checking the logs reveals an "oom_kill" event.

[dl239]

root cause described in #2944