zenoyang commented on pull request #7751:
URL: https://github.com/apache/incubator-doris/pull/7751#issuecomment-1012991943
test sql: `select count(distinct lo_partkey) from lineorder`
### before pr
Total: 15s147ms
```
VDataStreamSender (dst_id=3,
dst_fragments=[{"0297b49f50144c67-8175137460f3732a",
"0297b49f50144c67-8175137460f3732b",
"0297b49f50144c67-8175137460f3732c"}]):(Active: 13s155ms, % non-child: 86.86%)
VDataStreamSender (dst_id=3,
dst_fragments=[{"0297b49f50144c67-8175137460f3732a",
"0297b49f50144c67-8175137460f3732b",
"0297b49f50144c67-8175137460f3732c"}]):(Active: 13s87ms, % non-child: 86.41%)
VDataStreamSender (dst_id=3,
dst_fragments=[{"0297b49f50144c67-8175137460f3732a",
"0297b49f50144c67-8175137460f3732b",
"0297b49f50144c67-8175137460f3732c"}]):(Active: 12s833ms, % non-child: 84.73%)
VDataStreamSender cost:
13155*0.8686=11426.433 ms
13870*0.8641=11985.067 ms
12883*0.8473=10915.766 ms
```
### after pr
Total: 13s414ms
```
VDataStreamSender (dst_id=3,
dst_fragments=[{"f191f98c5e644df6-a05e405fde783be2",
"f191f98c5e644df6-a05e405fde783be3",
"f191f98c5e644df6-a05e405fde783be4"}]):(Active: 11s129ms, % non-child: 82.97%)
VDataStreamSender (dst_id=3,
dst_fragments=[{"f191f98c5e644df6-a05e405fde783be2",
"f191f98c5e644df6-a05e405fde783be3",
"f191f98c5e644df6-a05e405fde783be4"}]):(Active: 10s322ms, % non-child: 76.95%)
VDataStreamSender (dst_id=3,
dst_fragments=[{"f191f98c5e644df6-a05e405fde783be2",
"f191f98c5e644df6-a05e405fde783be3",
"f191f98c5e644df6-a05e405fde783be4"}]):(Active: 9s120ms, % non-child: 67.99%)
VDataStreamSender cost:
11129*0.8297=9233.731 ms
10322*0.7695=7942.779 ms
9120*0.6799=6200.688 ms
```
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