GitHub user yjhjstz added a comment to the discussion: [Proposal] Enhanced ORCA 
Parallel Planning to Align with PostgreSQL Planner

Based on ORCA's design patterns, the class hierarchy uses inheritance rather 
than composition for extending distribution specifications.

so  use `class CDistributionSpecWorkerRandom : public CDistributionSpecRandom` 
and

`class CDistributionSpecWorkerReplicated: public CDistributionSpecReplicated`


GitHub link: 
https://github.com/apache/cloudberry/discussions/1316#discussioncomment-14431516

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