[backport 2.3.x] BUG(string dtype): Empty sum produces incorrect resu… #23839
| Job | Run time |
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| 1h 16m 1s | |
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| 21m 38s | |
| 1h 20m 26s | |
| 46m 35s | |
| 44m 16s | |
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| 1h 13m 23s | |
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| 13m 38s | |
| 1m 33s | |
| 24m 55s | |
| 1h 30m 35s | |
| 1h 17m 45s | |
| 1h 0m 53s | |
| 1h 20m 54s | |
| 1h 11m 38s | |
| 1h 19m 51s | |
| 1h 17m 35s | |
| 1h 30m 34s | |
| 1h 30m 33s | |
| 1h 12m 4s | |
| 1h 21m 19s | |
| 9m 11s | |
| 1h 30m 33s | |
| 24m 51s | |
| 31m 0s | |
| 7m 34s | |
| 1h 30m 32s | |
| 1h 21m 36s | |
| 25m 42s | |
| 1h 19m 3s | |
| 1d 10h 18m 44s |