refactor(optimizer): Prepare DISTINCT planning - #1804
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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
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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