feat(optimizer): Plan DISTINCT with MarkDistinct - #1805
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Summary: Extract aggregate input preparation and physical stage selection so DISTINCT lowering can reuse them before aggregate stage selection without recursively replanning inputs. Move the existing pre-grouped-key calculation to shared physical properties without changing its behavior. Differential Revision: D117896114
Summary: Distributed v2 queries with `MarkDistinct` now choose marker distribution before selecting split vs. single steps for the aggregation. Previously, the late expansion pass inserted `MarkDistinct` after physical planning, leaving the DISTINCT aggregation to always take single-stage. Moves DISTINCT lowering into physical aggregate planning. Plans with one worker and one driver, or with pre-grouped input, continue using native DISTINCT. Removes the separate late expansion pass. Differential Revision: D117940699
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Summary:
Distributed v2 queries with
MarkDistinctnow choose marker distribution before selecting split vs. single steps for the aggregation. Previously, the late expansion pass insertedMarkDistinctafter physical planning, leaving the DISTINCT aggregation to always take single-stage.Moves DISTINCT lowering into physical aggregate planning. Plans with one worker and one driver, or with pre-grouped input, continue using native DISTINCT. Removes the separate late expansion pass.
Differential Revision: D117940699