pingcap / pingcap/tidb

Handle non-empty rootTask in PhysicalUnionAll#attach2MppTasks

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#46,813 0 comments 0 reactions 0 assignees View on GitHub
type/enhancement
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Description

## Enhancement
In `PhysicalUnionAll#attach2MppTasks`, when there is non-empty `rootTask`, we return `invalidTask`.

This seems counter-intuitive: at this point, `childPlans` may be non-empty.

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