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                                            guo-shaoge

mysql_test: disaggregated_tiflash

Signed-off-by: guo-shaoge

test

### What problem does this PR solve? Issue Number: close #xxx Problem Summary: ### What changed and how does it work? ### Check List Tests - [ ] Unit test...

sig/planner

size/M

release-note-none

do-not-merge/needs-linked-issue

do-not-merge/invalid-title

do-not-merge/needs-tests-checked

Refine memory usage of RowContainer

## Enhancement [RowContainer](https://github.com/pingcap/tidb/blob/b9a31b231a7d9a64da81cb071b3db26fcb55cc38/pkg/util/chunk/row_container.go#L91) is used for spilling during execution of TiDB operator execution. But there are lots of temp small objects allocated during spilling. Check [heap_tidb_10.71.222.131_4000_1719544680.txt](https://github.com/user-attachments/files/16023854/heap_tidb_10.71.222.131_4000_1719544680.txt) (PS rename to heap.proto...

type/enhancement