memory-related improvement
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type/enhancement
- Dominant language
- Go
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Description
## Enhancement
- [x] query killed by global memory controller unexpectedly https://github.com/pingcap/tidb/issues/42662
- [x] query with memory usage 0 be killed https://github.com/pingcap/tidb/issues/42664
- [ ] indexmerge exits slowly when Out Of Memory Quota panic is triggered https://github.com/pingcap/tidb/issues/42398
- [x] Refine the error message of Out Of Memory Quota https://github.com/pingcap/tidb/issues/42044
- [ ] set the default value of tidb_mem_quota_query to min(5GB, 50%*MAX_MEM) https://github.com/pingcap/tidb/issues/42317
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