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Limit GroupByCombineOperator to use 2 * numCores threads instead of creating one task per operator #31196

Limit GroupByCombineOperator to use 2 * numCores threads instead of creating one task per operator

Limit GroupByCombineOperator to use 2 * numCores threads instead of creating one task per operator #31196

Job Run time
1m 44s
40m 52s
50m 56s
40m 45s
40m 37s
48m 58s
39m 47s
38m 44s
18m 58s
40m 39s
18m 40s
38m 37s
19m 35s
49m 5s
49m 17s
37m 37s
42m 19s
45m 38s
41m 42s
41m 3s
40m 58s
13h 6m 31s