目前的解决方案是，去掉内存限制，参数max_memory_usage和max_memory_usage_for_all_queries如下：
tiflash:
logger.count: 5
logger.level: warning
profiles.default.batch_cop_pool_size: 32
profiles.default.cop_pool_size: 32
profiles.default.max_memory_usage: 0
profiles.default.max_memory_usage_for_all_queries: 0
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