BUG: pivot_table with overlapping values #23056

Job	Run time
Pyodide build	18m 45s
Linux-32-bit	18m 34s
Linux-Musl	16m 12s
python-freethreading	18m 44s
macos-13 actions-310.yaml	18m 34s
macos-13 actions-311.yaml	18m 34s
macos-13 actions-312.yaml	18m 34s
macos-14 actions-310.yaml	19m 5s
macos-14 actions-311.yaml	18m 57s
macos-14 actions-312.yaml	18m 59s
windows-latest actions-311.yaml	18m 30s
windows-latest actions-312.yaml	18m 33s
windows-latest actions-310.yaml	18m 30s
python-dev (macOS-13)	18m 8s
python-dev (macOS-14)	10m 28s
python-dev (ubuntu-22.04)	18m 44s
python-dev (windows-latest)	18m 41s
Minimum Versions	18m 34s
Future infer strings (without pyarrow)	18m 32s
Locale: zh_CN	18m 36s
Locale: it_IT	18m 34s
Downstream Compat	6m 39s
Numpy Dev	17m 34s
Pyarrow Nightly	18m 50s
Future infer strings	18m 33s
Pypy	1m 36s
ubuntu-22.04 actions-310.yaml	18m 36s
ubuntu-22.04 actions-312.yaml	18m 32s
ubuntu-22.04 actions-311.yaml	18m 33s
ubuntu-24.04-arm actions-312.yaml	18m 20s
ubuntu-24.04-arm actions-311.yaml	18m 43s
ubuntu-24.04-arm actions-310.yaml	18m 48s
	9h 15m 32s

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