branch:4.2: [improvement](cascades) Fuse project pushdown into join reorder #67541 - #68289
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Problem Summary: AddProjectForJoin inserts a Project above every Join before classic Cascades exploration. The standalone PushDownProjectThroughSemiJoin and PushDownProjectThroughInnerOuterJoin rules therefore expand child groups and assemble temporary plans for many slot-only Projects before rejecting them. Reuse a shared Project normalization helper from the Project-aware join reorder rules and remove the standalone rules from classic registration, while preserving their after-DPHyp registration. Local plan-only comparison kept the physical plan fingerprint and root cost unchanged for 122 TPC-H, TPC-DS, and DPHyp smoke queries. Across 12 JMH configurations, candidate mean planning time and allocation per operation were lower in every configuration; a 9-table JFR workload reduced matcher allocation by 34.4% and plan-assembly allocation by 39.4%.
Reduce Nereids classic Cascades planning overhead for queries with multiple joins.
- Test: Unit Test
- 24 targeted FE unit tests passed
- FE Checkstyle passed
- Behavior changed: Yes. Classic Cascades performs complex Project normalization only while producing join reorder alternatives; after-DPHyp behavior is unchanged.
- Does this need documentation: No
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morrySnow
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picked from #67541