BUG: pivot_table with overlapping values #23059

Job	Run time
Linux-32-bit	18m 19s
Linux-Musl	16m 22s
python-freethreading	22m 47s
Pyodide build	23m 41s
python-dev (macOS-13)	21m 4s
python-dev (macOS-14)	10m 6s
python-dev (ubuntu-22.04)	20m 24s
python-dev (windows-latest)	22m 37s
macos-13 actions-310.yaml	36m 22s
macos-13 actions-311.yaml	31m 54s
macos-13 actions-312.yaml	31m 34s
macos-14 actions-310.yaml	13m 54s
macos-14 actions-311.yaml	16m 1s
macos-14 actions-312.yaml	14m 32s
windows-latest actions-311.yaml	34m 3s
windows-latest actions-312.yaml	39m 8s
windows-latest actions-310.yaml	34m 29s
Minimum Versions	23m 46s
Future infer strings (without pyarrow)	38m 23s
Locale: zh_CN	23m 31s
Locale: it_IT	23m 11s
Downstream Compat	5m 40s
Numpy Dev	17m 8s
Pyarrow Nightly	20m 16s
Future infer strings	45m 0s
Pypy	1m 25s
ubuntu-22.04 actions-310.yaml	46m 43s
ubuntu-22.04 actions-311.yaml	43m 5s
ubuntu-22.04 actions-312.yaml	43m 57s
ubuntu-24.04-arm actions-311.yaml	35m 29s
ubuntu-24.04-arm actions-312.yaml	34m 57s
ubuntu-24.04-arm actions-310.yaml	36m 36s
	14h 6m 24s

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