BUG: pivot_table with overlapping values #22953

Job	Run time
Pyodide build	23m 32s
Linux-32-bit	18m 30s
Linux-Musl	16m 26s
python-freethreading	22m 15s
python-dev (macOS-13)	23m 43s
python-dev (macOS-14)	10m 11s
python-dev (ubuntu-22.04)	20m 47s
python-dev (windows-latest)	23m 1s
macos-13 actions-311.yaml	35m 42s
macos-14 actions-310.yaml	24m 20s
macos-13 actions-310.yaml	34m 50s
macos-13 actions-312.yaml	48m 4s
macos-14 actions-311.yaml	24m 21s
macos-14 actions-312.yaml	13m 37s
windows-latest actions-311.yaml	36m 33s
windows-latest actions-310.yaml	34m 28s
windows-latest actions-312.yaml	42m 52s
Minimum Versions	23m 54s
Future infer strings (without pyarrow)	40m 36s
Locale: zh_CN	23m 52s
Locale: it_IT	23m 34s
Downstream Compat	6m 4s
Numpy Dev	16m 55s
Pyarrow Nightly	21m 19s
Pypy	1m 30s
Future infer strings	45m 57s
ubuntu-22.04 actions-310.yaml	46m 8s
ubuntu-22.04 actions-311.yaml	42m 44s
ubuntu-22.04 actions-312.yaml	43m 18s
ubuntu-24.04-arm actions-312.yaml	35m 37s
ubuntu-24.04-arm actions-311.yaml	33m 43s
ubuntu-24.04-arm actions-310.yaml	36m 57s
	14h 55m 20s

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