GitHub user lidavidm added a comment to the discussion: Querying PostgreSQL 
generate_subscripts from Python with a dimension from bound parameters

Yeah, I think for now it would be best to query that schema then build the 
batch by hand. Eventually I think the PostgreSQL driver should internally 
reconcile the parameter types with the Arrow types (with the caveat that 
PostgreSQL doesn't, to my knowledge, indicate when multiple types are possible 
for a parameter so this may force certain values to an unexpected type - this 
is also why I'm hesitant to change the current behavior)

GitHub link: 
https://github.com/apache/arrow-adbc/discussions/2865#discussioncomment-15223426

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