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fix: #1574 nullable return types for groupby functions
This is a proposed fix for https://github.com/kyleconroy/sqlc/issues/1574. I am unsure if this change breaks any tests because I don't have a correctly setup postgres instance to generate pg_catalog correctly with all extensions. However, I have checked that this change fixes the bug.
I haven't found any docs that mention what postgres instance I should use to generate pg_catalog. This is needed to complete the pull request and fix tests. Could anyone direct me on where to look?