liutang123 opened a new pull request #4482:
URL: https://github.com/apache/incubator-doris/pull/4482
For #4481.
## Proposed changes
In DistributedPlanner, do not add the unnecessary Exchanges.
For case 1, we only need to judge that the table's distribute hash keys is a
subset of the aggregate keys.
For case 2, we should jude two conditions:
- partition keys are also hash keys.
- the table's distribute hash keys is a subset of the aggregate keys.
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