BUG: pivot_table with overlapping values #22939

Job	Run time
Linux-Musl	6m 49s
Linux-32-bit	6m 46s
python-dev (macOS-13)	6m 50s
python-dev (macOS-14)	6m 46s
python-dev (ubuntu-22.04)	6m 48s
python-dev (windows-latest)	6m 39s
Pyodide build	6m 52s
python-freethreading	6m 48s
macos-13 actions-310.yaml	6m 47s
macos-13 actions-312.yaml	6m 39s
macos-13 actions-311.yaml	6m 46s
macos-14 actions-310.yaml	6m 47s
macos-14 actions-311.yaml	6m 49s
macos-14 actions-312.yaml	6m 45s
windows-latest actions-311.yaml	6m 42s
windows-latest actions-312.yaml	6m 52s
windows-latest actions-310.yaml	7m 3s
Minimum Versions	6m 47s
Future infer strings (without pyarrow)	11m 30s
Locale: zh_CN	6m 45s
Locale: it_IT	6m 51s
Downstream Compat	5m 57s
Pyarrow Nightly	6m 47s
Numpy Dev	6m 48s
Future infer strings	11m 31s
Pypy	1m 19s
ubuntu-22.04 actions-310.yaml	11m 31s
ubuntu-22.04 actions-311.yaml	11m 31s
ubuntu-22.04 actions-312.yaml	11m 34s
ubuntu-24.04-arm actions-311.yaml	11m 29s
ubuntu-24.04-arm actions-312.yaml	11m 31s
ubuntu-24.04-arm actions-310.yaml	11m 24s
	4h 8m 43s

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