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由 Heikki Linnakangas 提交于
It wasn't very useful. ORCA and Postgres both just stack WindowAgg nodes on top of each other, and no-one's been unhappy about that, so we might as well do that, too. This reduces the difference between GPDB and the upstream implementation, and will hopefully make it smoother to switch. Rename the Window Plan node type to WindowAgg, to match upstream, now that it is fairly close to the upstream version.
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