1. the following query is so slow, after 12 hours, 
I kill it -
delete from doc where cdi in (select cdi from doc_b1);
doc_b1 records = 40000
doc records = 5000000
cdi are indexed in both table.

2. I rewrite the above task in plpgsql, it
takes 10 secs to finish. 

why psql subquery is not smarter enough to use
indexes if obviously?


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