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

Essentially, yes. (I think the Python side still needs updating to use that 
info when converting Python objects to Arrow data, though.) Also note that the 
inference is not perfect. (`SELECT $1` will result in `$1` defaulting to 
varchar, even though in principle it could be anything.)

GitHub link: 
https://github.com/apache/arrow-adbc/discussions/2865#discussioncomment-13279020

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