BUG: Fix multiindex factorize extension dtypes #27742
| Job | Run time |
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| 21m 45s | |
| 15m 38s | |
| 14m 1s | |
| 11m 20s | |
| 14m 32s | |
| 18m 27s | |
| 14m 46s | |
| 32m 43s | |
| 34m 12s | |
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| 35m 40s | |
| 47m 27s | |
| 41m 32s | |
| 29m 29s | |
| 49m 50s | |
| 37m 39s | |
| 27m 57s | |
| 27m 10s | |
| 40m 33s | |
| 36m 20s | |
| 23m 16s | |
| 44m 10s | |
| 42m 12s | |
| 11m 6s | |
| 16m 20s | |
| 35m 9s | |
| 5m 8s | |
| 21m 39s | |
| 19m 54s | |
| 35m 8s | |
| 14h 50m 33s |