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Do not add exchange when table's distributioin satisfy the distribution requirements - #4482
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…on requirements For apache#4481. 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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ZhangYu0123 pushed a commit
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Sep 1, 2020
…on requirements (apache#4482) 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 judge 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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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: