Hi all,
apologize if this is a trivial question but I'd like to understand what values 
are stored in the RelOptInfo->reltargetlist or, better, how I can check such 
values in the information schema to understand what they refer to. I've tried 
to look in the pg_attribute table but I was not able to find a match. In other 
words, how can I check what is the oid of the listcell pointing to in the 
database schema?


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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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