To limit NL usage, wouldn't a modified set of Planner Cost Constants 
https://www.postgresql.org/docs/current/static/runtime-config-query.html
<https://www.postgresql.org/docs/current/static/runtime-config-query.html>  

seq_page_cost 
random_page_cost 
cpu_tuple_cost 
cpu_index_tuple_cost 
cpu_operator_cost 

be more hash join freindly (as Oracle' optimizer_index_cost_adj )?



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