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Create a function variable "join_search_hook" to let plugins override the
join search order portion of the planner; this is specifically intended tosimplify developing a replacement for GEQO planning. Patch by JuliusStroffek, editorialized on by me. I renamed make_one_rel_by_joins tostandard_join_search and make_rels_by_joins to join_search_one_level to betterreflect their place within this scheme.1 parent149af06 commitcdf0231
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